/vendor/assets/javascripts/lodash.js

/**
 * @license
 * Lo-Dash 1.3.0 (Custom Build) <http://lodash.com/>
 * Build: `lodash minus="template" -d`
 * Copyright 2012-2013 The Dojo Foundation <http://dojofoundation.org/>
 * Based on Underscore.js 1.4.4 <http://underscorejs.org/>
 * Copyright 2009-2013 Jeremy Ashkenas, DocumentCloud Inc.
 * Available under MIT license <http://lodash.com/license>
 */
;(function(window) {

  /** Used as a safe reference for `undefined` in pre ES5 environments */
  var undefined;

  /** Used to pool arrays and objects used internally */
  var arrayPool = [],
      objectPool = [];

  /** Used to generate unique IDs */
  var idCounter = 0;

  /** Used internally to indicate various things */
  var indicatorObject = {};

  /** Used to prefix keys to avoid issues with `__proto__` and properties on `Object.prototype` */
  var keyPrefix = +new Date + '';

  /** Used as the size when optimizations are enabled for large arrays */
  var largeArraySize = 75;

  /** Used as the max size of the `arrayPool` and `objectPool` */
  var maxPoolSize = 10;

  /** Used to match empty string literals in compiled template source */
  var reEmptyStringLeading = /\b__p \+= '';/g,
      reEmptyStringMiddle = /\b(__p \+=) '' \+/g,
      reEmptyStringTrailing = /(__e\(.*?\)|\b__t\)) \+\n'';/g;

  /** Used to match HTML entities */
  var reEscapedHtml = /&(?:amp|lt|gt|quot|#39);/g;

  /**
   * Used to match ES6 template delimiters
   * http://people.mozilla.org/~jorendorff/es6-draft.html#sec-7.8.6
   */
  var reEsTemplate = /\$\{([^\\}]*(?:\\.[^\\}]*)*)\}/g;

  /** Used to match regexp flags from their coerced string values */
  var reFlags = /\w*$/;

  /** Used to match "interpolate" template delimiters */
  var reInterpolate = /<%=([\s\S]+?)%>/g;

  /** Used to detect functions containing a `this` reference */
  var reThis = (reThis = /\bthis\b/) && reThis.test(runInContext) && reThis;

  /** Used to detect and test whitespace */
  var whitespace = (
    // whitespace
    ' \t\x0B\f\xA0\ufeff' +

    // line terminators
    '\n\r\u2028\u2029' +

    // unicode category "Zs" space separators
    '\u1680\u180e\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u202f\u205f\u3000'
  );

  /** Used to match leading whitespace and zeros to be removed */
  var reLeadingSpacesAndZeros = RegExp('^[' + whitespace + ']*0+(?=.$)');

  /** Used to ensure capturing order of template delimiters */
  var reNoMatch = /($^)/;

  /** Used to match HTML characters */
  var reUnescapedHtml = /[&<>"']/g;

  /** Used to match unescaped characters in compiled string literals */
  var reUnescapedString = /['\n\r\t\u2028\u2029\\]/g;

  /** Used to assign default `context` object properties */
  var contextProps = [
    'Array', 'Boolean', 'Date', 'Error', 'Function', 'Math', 'Number', 'Object',
    'RegExp', 'String', '_', 'attachEvent', 'clearTimeout', 'isFinite', 'isNaN',
    'parseInt', 'setImmediate', 'setTimeout'
  ];

  /** Used to fix the JScript [[DontEnum]] bug */
  var shadowedProps = [
    'constructor', 'hasOwnProperty', 'isPrototypeOf', 'propertyIsEnumerable',
    'toLocaleString', 'toString', 'valueOf'
  ];

  /** Used to make template sourceURLs easier to identify */
  var templateCounter = 0;

  /** `Object#toString` result shortcuts */
  var argsClass = '[object Arguments]',
      arrayClass = '[object Array]',
      boolClass = '[object Boolean]',
      dateClass = '[object Date]',
      errorClass = '[object Error]',
      funcClass = '[object Function]',
      numberClass = '[object Number]',
      objectClass = '[object Object]',
      regexpClass = '[object RegExp]',
      stringClass = '[object String]';

  /** Used to identify object classifications that `_.clone` supports */
  var cloneableClasses = {};
  cloneableClasses[funcClass] = false;
  cloneableClasses[argsClass] = cloneableClasses[arrayClass] =
  cloneableClasses[boolClass] = cloneableClasses[dateClass] =
  cloneableClasses[numberClass] = cloneableClasses[objectClass] =
  cloneableClasses[regexpClass] = cloneableClasses[stringClass] = true;

  /** Used to determine if values are of the language type Object */
  var objectTypes = {
    'boolean': false,
    'function': true,
    'object': true,
    'number': false,
    'string': false,
    'undefined': false
  };

  /** Used to escape characters for inclusion in compiled string literals */
  var stringEscapes = {
    '\\': '\\',
    "'": "'",
    '\n': 'n',
    '\r': 'r',
    '\t': 't',
    '\u2028': 'u2028',
    '\u2029': 'u2029'
  };

  /** Detect free variable `exports` */
  var freeExports = objectTypes[typeof exports] && exports;

  /** Detect free variable `module` */
  var freeModule = objectTypes[typeof module] && module && module.exports == freeExports && module;

  /** Detect free variable `global`, from Node.js or Browserified code, and use it as `window` */
  var freeGlobal = objectTypes[typeof global] && global;
  if (freeGlobal && (freeGlobal.global === freeGlobal || freeGlobal.window === freeGlobal)) {
    window = freeGlobal;
  }

  /*--------------------------------------------------------------------------*/

  /**
   * A basic implementation of `_.indexOf` without support for binary searches
   * or `fromIndex` constraints.
   *
   * @private
   * @param {Array} array The array to search.
   * @param {Mixed} value The value to search for.
   * @param {Number} [fromIndex=0] The index to search from.
   * @returns {Number} Returns the index of the matched value or `-1`.
   */
  function basicIndexOf(array, value, fromIndex) {
    var index = (fromIndex || 0) - 1,
        length = array.length;

    while (++index < length) {
      if (array[index] === value) {
        return index;
      }
    }
    return -1;
  }

  /**
   * An implementation of `_.contains` for cache objects that mimics the return
   * signature of `_.indexOf` by returning `0` if the value is found, else `-1`.
   *
   * @private
   * @param {Object} cache The cache object to inspect.
   * @param {Mixed} value The value to search for.
   * @returns {Number} Returns `0` if `value` is found, else `-1`.
   */
  function cacheIndexOf(cache, value) {
    var type = typeof value;
    cache = cache.cache;

    if (type == 'boolean' || value == null) {
      return cache[value];
    }
    if (type != 'number' && type != 'string') {
      type = 'object';
    }
    var key = type == 'number' ? value : keyPrefix + value;
    cache = cache[type] || (cache[type] = {});

    return type == 'object'
      ? (cache[key] && basicIndexOf(cache[key], value) > -1 ? 0 : -1)
      : (cache[key] ? 0 : -1);
  }

  /**
   * Adds a given `value` to the corresponding cache object.
   *
   * @private
   * @param {Mixed} value The value to add to the cache.
   */
  function cachePush(value) {
    var cache = this.cache,
        type = typeof value;

    if (type == 'boolean' || value == null) {
      cache[value] = true;
    } else {
      if (type != 'number' && type != 'string') {
        type = 'object';
      }
      var key = type == 'number' ? value : keyPrefix + value,
          typeCache = cache[type] || (cache[type] = {});

      if (type == 'object') {
        if ((typeCache[key] || (typeCache[key] = [])).push(value) == this.array.length) {
          cache[type] = false;
        }
      } else {
        typeCache[key] = true;
      }
    }
  }

  /**
   * Used by `_.max` and `_.min` as the default `callback` when a given
   * `collection` is a string value.
   *
   * @private
   * @param {String} value The character to inspect.
   * @returns {Number} Returns the code unit of given character.
   */
  function charAtCallback(value) {
    return value.charCodeAt(0);
  }

  /**
   * Used by `sortBy` to compare transformed `collection` values, stable sorting
   * them in ascending order.
   *
   * @private
   * @param {Object} a The object to compare to `b`.
   * @param {Object} b The object to compare to `a`.
   * @returns {Number} Returns the sort order indicator of `1` or `-1`.
   */
  function compareAscending(a, b) {
    var ai = a.index,
        bi = b.index;

    a = a.criteria;
    b = b.criteria;

    // ensure a stable sort in V8 and other engines
    // http://code.google.com/p/v8/issues/detail?id=90
    if (a !== b) {
      if (a > b || typeof a == 'undefined') {
        return 1;
      }
      if (a < b || typeof b == 'undefined') {
        return -1;
      }
    }
    return ai < bi ? -1 : 1;
  }

  /**
   * Creates a cache object to optimize linear searches of large arrays.
   *
   * @private
   * @param {Array} [array=[]] The array to search.
   * @returns {Null|Object} Returns the cache object or `null` if caching should not be used.
   */
  function createCache(array) {
    var index = -1,
        length = array.length;

    var cache = getObject();
    cache['false'] = cache['null'] = cache['true'] = cache['undefined'] = false;

    var result = getObject();
    result.array = array;
    result.cache = cache;
    result.push = cachePush;

    while (++index < length) {
      result.push(array[index]);
    }
    return cache.object === false
      ? (releaseObject(result), null)
      : result;
  }

  /**
   * Used by `template` to escape characters for inclusion in compiled
   * string literals.
   *
   * @private
   * @param {String} match The matched character to escape.
   * @returns {String} Returns the escaped character.
   */
  function escapeStringChar(match) {
    return '\\' + stringEscapes[match];
  }

  /**
   * Gets an array from the array pool or creates a new one if the pool is empty.
   *
   * @private
   * @returns {Array} The array from the pool.
   */
  function getArray() {
    return arrayPool.pop() || [];
  }

  /**
   * Gets an object from the object pool or creates a new one if the pool is empty.
   *
   * @private
   * @returns {Object} The object from the pool.
   */
  function getObject() {
    return objectPool.pop() || {
      'args': '',
      'array': null,
      'bottom': '',
      'criteria': null,
      'false': false,
      'firstArg': '',
      'index': 0,
      'init': '',
      'leading': false,
      'loop': '',
      'maxWait': 0,
      'null': false,
      'number': null,
      'object': null,
      'push': null,
      'shadowedProps': null,
      'string': null,
      'top': '',
      'trailing': false,
      'true': false,
      'undefined': false,
      'useHas': false,
      'useKeys': false,
      'value': null
    };
  }

  /**
   * Checks if `value` is a DOM node in IE < 9.
   *
   * @private
   * @param {Mixed} value The value to check.
   * @returns {Boolean} Returns `true` if the `value` is a DOM node, else `false`.
   */
  function isNode(value) {
    // IE < 9 presents DOM nodes as `Object` objects except they have `toString`
    // methods that are `typeof` "string" and still can coerce nodes to strings
    return typeof value.toString != 'function' && typeof (value + '') == 'string';
  }

  /**
   * A no-operation function.
   *
   * @private
   */
  function noop() {
    // no operation performed
  }

  /**
   * Releases the given `array` back to the array pool.
   *
   * @private
   * @param {Array} [array] The array to release.
   */
  function releaseArray(array) {
    if (arrayPool.length == maxPoolSize) {
      arrayPool.length = maxPoolSize - 1;
    }
    array.length = 0;
    arrayPool.push(array);
  }

  /**
   * Releases the given `object` back to the object pool.
   *
   * @private
   * @param {Object} [object] The object to release.
   */
  function releaseObject(object) {
    var cache = object.cache;
    if (cache) {
      releaseObject(cache);
    }
    if (objectPool.length == maxPoolSize) {
      objectPool.length = maxPoolSize - 1;
    }
    object.array = object.cache = object.criteria = object.object = object.number = object.string = object.value = null;
    objectPool.push(object);
  }

  /**
   * Slices the `collection` from the `start` index up to, but not including,
   * the `end` index.
   *
   * Note: This function is used, instead of `Array#slice`, to support node lists
   * in IE < 9 and to ensure dense arrays are returned.
   *
   * @private
   * @param {Array|Object|String} collection The collection to slice.
   * @param {Number} start The start index.
   * @param {Number} end The end index.
   * @returns {Array} Returns the new array.
   */
  function slice(array, start, end) {
    start || (start = 0);
    if (typeof end == 'undefined') {
      end = array ? array.length : 0;
    }
    var index = -1,
        length = end - start || 0,
        result = Array(length < 0 ? 0 : length);

    while (++index < length) {
      result[index] = array[start + index];
    }
    return result;
  }

  /*--------------------------------------------------------------------------*/

  /**
   * Create a new `lodash` function using the given `context` object.
   *
   * @static
   * @memberOf _
   * @category Utilities
   * @param {Object} [context=window] The context object.
   * @returns {Function} Returns the `lodash` function.
   */
  function runInContext(context) {
    // Avoid issues with some ES3 environments that attempt to use values, named
    // after built-in constructors like `Object`, for the creation of literals.
    // ES5 clears this up by stating that literals must use built-in constructors.
    // See http://es5.github.com/#x11.1.5.
    context = context ? _.defaults(window.Object(), context, _.pick(window, contextProps)) : window;

    /** Native constructor references */
    var Array = context.Array,
        Boolean = context.Boolean,
        Date = context.Date,
        Error = context.Error,
        Function = context.Function,
        Math = context.Math,
        Number = context.Number,
        Object = context.Object,
        RegExp = context.RegExp,
        String = context.String,
        TypeError = context.TypeError;

    /**
     * Used for `Array` method references.
     *
     * Normally `Array.prototype` would suffice, however, using an array literal
     * avoids issues in Narwhal.
     */
    var arrayRef = [];

    /** Used for native method references */
    var errorProto = Error.prototype,
        objectProto = Object.prototype,
        stringProto = String.prototype;

    /** Used to restore the original `_` reference in `noConflict` */
    var oldDash = context._;

    /** Used to detect if a method is native */
    var reNative = RegExp('^' +
      String(objectProto.valueOf)
        .replace(/[.*+?^${}()|[\]\\]/g, '\\$&')
        .replace(/valueOf|for [^\]]+/g, '.+?') + '$'
    );

    /** Native method shortcuts */
    var ceil = Math.ceil,
        clearTimeout = context.clearTimeout,
        concat = arrayRef.concat,
        floor = Math.floor,
        fnToString = Function.prototype.toString,
        getPrototypeOf = reNative.test(getPrototypeOf = Object.getPrototypeOf) && getPrototypeOf,
        hasOwnProperty = objectProto.hasOwnProperty,
        push = arrayRef.push,
        propertyIsEnumerable = objectProto.propertyIsEnumerable,
        setImmediate = context.setImmediate,
        setTimeout = context.setTimeout,
        toString = objectProto.toString;

    /* Native method shortcuts for methods with the same name as other `lodash` methods */
    var nativeBind = reNative.test(nativeBind = toString.bind) && nativeBind,
        nativeCreate = reNative.test(nativeCreate =  Object.create) && nativeCreate,
        nativeIsArray = reNative.test(nativeIsArray = Array.isArray) && nativeIsArray,
        nativeIsFinite = context.isFinite,
        nativeIsNaN = context.isNaN,
        nativeKeys = reNative.test(nativeKeys = Object.keys) && nativeKeys,
        nativeMax = Math.max,
        nativeMin = Math.min,
        nativeParseInt = context.parseInt,
        nativeRandom = Math.random,
        nativeSlice = arrayRef.slice;

    /** Detect various environments */
    var isIeOpera = reNative.test(context.attachEvent),
        isV8 = nativeBind && !/\n|true/.test(nativeBind + isIeOpera);

    /** Used to lookup a built-in constructor by [[Class]] */
    var ctorByClass = {};
    ctorByClass[arrayClass] = Array;
    ctorByClass[boolClass] = Boolean;
    ctorByClass[dateClass] = Date;
    ctorByClass[funcClass] = Function;
    ctorByClass[objectClass] = Object;
    ctorByClass[numberClass] = Number;
    ctorByClass[regexpClass] = RegExp;
    ctorByClass[stringClass] = String;

    /** Used to avoid iterating non-enumerable properties in IE < 9 */
    var nonEnumProps = {};
    nonEnumProps[arrayClass] = nonEnumProps[dateClass] = nonEnumProps[numberClass] = { 'constructor': true, 'toLocaleString': true, 'toString': true, 'valueOf': true };
    nonEnumProps[boolClass] = nonEnumProps[stringClass] = { 'constructor': true, 'toString': true, 'valueOf': true };
    nonEnumProps[errorClass] = nonEnumProps[funcClass] = nonEnumProps[regexpClass] = { 'constructor': true, 'toString': true };
    nonEnumProps[objectClass] = { 'constructor': true };

    (function() {
      var length = shadowedProps.length;
      while (length--) {
        var prop = shadowedProps[length];
        for (var className in nonEnumProps) {
          if (hasOwnProperty.call(nonEnumProps, className) && !hasOwnProperty.call(nonEnumProps[className], prop)) {
            nonEnumProps[className][prop] = false;
          }
        }
      }
    }());

    /*--------------------------------------------------------------------------*/

    /**
     * Creates a `lodash` object, which wraps the given `value`, to enable method
     * chaining.
     *
     * In addition to Lo-Dash methods, wrappers also have the following `Array` methods:
     * `concat`, `join`, `pop`, `push`, `reverse`, `shift`, `slice`, `sort`, `splice`,
     * and `unshift`
     *
     * Chaining is supported in custom builds as long as the `value` method is
     * implicitly or explicitly included in the build.
     *
     * The chainable wrapper functions are:
     * `after`, `assign`, `bind`, `bindAll`, `bindKey`, `chain`, `compact`,
     * `compose`, `concat`, `countBy`, `createCallback`, `debounce`, `defaults`,
     * `defer`, `delay`, `difference`, `filter`, `flatten`, `forEach`, `forIn`,
     * `forOwn`, `functions`, `groupBy`, `initial`, `intersection`, `invert`,
     * `invoke`, `keys`, `map`, `max`, `memoize`, `merge`, `min`, `object`, `omit`,
     * `once`, `pairs`, `partial`, `partialRight`, `pick`, `pluck`, `push`, `range`,
     * `reject`, `rest`, `reverse`, `shuffle`, `slice`, `sort`, `sortBy`, `splice`,
     * `tap`, `throttle`, `times`, `toArray`, `transform`, `union`, `uniq`, `unshift`,
     * `unzip`, `values`, `where`, `without`, `wrap`, and `zip`
     *
     * The non-chainable wrapper functions are:
     * `clone`, `cloneDeep`, `contains`, `escape`, `every`, `find`, `has`,
     * `identity`, `indexOf`, `isArguments`, `isArray`, `isBoolean`, `isDate`,
     * `isElement`, `isEmpty`, `isEqual`, `isFinite`, `isFunction`, `isNaN`,
     * `isNull`, `isNumber`, `isObject`, `isPlainObject`, `isRegExp`, `isString`,
     * `isUndefined`, `join`, `lastIndexOf`, `mixin`, `noConflict`, `parseInt`,
     * `pop`, `random`, `reduce`, `reduceRight`, `result`, `shift`, `size`, `some`,
     * `sortedIndex`, `runInContext`, `template`, `unescape`, `uniqueId`, and `value`
     *
     * The wrapper functions `first` and `last` return wrapped values when `n` is
     * passed, otherwise they return unwrapped values.
     *
     * @name _
     * @constructor
     * @alias chain
     * @category Chaining
     * @param {Mixed} value The value to wrap in a `lodash` instance.
     * @returns {Object} Returns a `lodash` instance.
     * @example
     *
     * var wrapped = _([1, 2, 3]);
     *
     * // returns an unwrapped value
     * wrapped.reduce(function(sum, num) {
     *   return sum + num;
     * });
     * // => 6
     *
     * // returns a wrapped value
     * var squares = wrapped.map(function(num) {
     *   return num * num;
     * });
     *
     * _.isArray(squares);
     * // => false
     *
     * _.isArray(squares.value());
     * // => true
     */
    function lodash(value) {
      // don't wrap if already wrapped, even if wrapped by a different `lodash` constructor
      return (value && typeof value == 'object' && !isArray(value) && hasOwnProperty.call(value, '__wrapped__'))
       ? value
       : new lodashWrapper(value);
    }

    /**
     * A fast path for creating `lodash` wrapper objects.
     *
     * @private
     * @param {Mixed} value The value to wrap in a `lodash` instance.
     * @returns {Object} Returns a `lodash` instance.
     */
    function lodashWrapper(value) {
      this.__wrapped__ = value;
    }
    // ensure `new lodashWrapper` is an instance of `lodash`
    lodashWrapper.prototype = lodash.prototype;

    /**
     * An object used to flag environments features.
     *
     * @static
     * @memberOf _
     * @type Object
     */
    var support = lodash.support = {};

    (function() {
      var ctor = function() { this.x = 1; },
          object = { '0': 1, 'length': 1 },
          props = [];

      ctor.prototype = { 'valueOf': 1, 'y': 1 };
      for (var prop in new ctor) { props.push(prop); }
      for (prop in arguments) { }

      /**
       * Detect if `arguments` objects are `Object` objects (all but Narwhal and Opera < 10.5).
       *
       * @memberOf _.support
       * @type Boolean
       */
      support.argsObject = arguments.constructor == Object && !(arguments instanceof Array);

      /**
       * Detect if an `arguments` object's [[Class]] is resolvable (all but Firefox < 4, IE < 9).
       *
       * @memberOf _.support
       * @type Boolean
       */
      support.argsClass = isArguments(arguments);

      /**
       * Detect if `name` or `message` properties of `Error.prototype` are
       * enumerable by default. (IE < 9, Safari < 5.1)
       *
       * @memberOf _.support
       * @type Boolean
       */
      support.enumErrorProps = propertyIsEnumerable.call(errorProto, 'message') || propertyIsEnumerable.call(errorProto, 'name');

      /**
       * Detect if `prototype` properties are enumerable by default.
       *
       * Firefox < 3.6, Opera > 9.50 - Opera < 11.60, and Safari < 5.1
       * (if the prototype or a property on the prototype has been set)
       * incorrectly sets a function's `prototype` property [[Enumerable]]
       * value to `true`.
       *
       * @memberOf _.support
       * @type Boolean
       */
      support.enumPrototypes = propertyIsEnumerable.call(ctor, 'prototype');

      /**
       * Detect if `Function#bind` exists and is inferred to be fast (all but V8).
       *
       * @memberOf _.support
       * @type Boolean
       */
      support.fastBind = nativeBind && !isV8;

      /**
       * Detect if own properties are iterated after inherited properties (all but IE < 9).
       *
       * @memberOf _.support
       * @type Boolean
       */
      support.ownLast = props[0] != 'x';

      /**
       * Detect if `arguments` object indexes are non-enumerable
       * (Firefox < 4, IE < 9, PhantomJS, Safari < 5.1).
       *
       * @memberOf _.support
       * @type Boolean
       */
      support.nonEnumArgs = prop != 0;

      /**
       * Detect if properties shadowing those on `Object.prototype` are non-enumerable.
       *
       * In IE < 9 an objects own properties, shadowing non-enumerable ones, are
       * made non-enumerable as well (a.k.a the JScript [[DontEnum]] bug).
       *
       * @memberOf _.support
       * @type Boolean
       */
      support.nonEnumShadows = !/valueOf/.test(props);

      /**
       * Detect if `Array#shift` and `Array#splice` augment array-like objects correctly.
       *
       * Firefox < 10, IE compatibility mode, and IE < 9 have buggy Array `shift()`
       * and `splice()` functions that fail to remove the last element, `value[0]`,
       * of array-like objects even though the `length` property is set to `0`.
       * The `shift()` method is buggy in IE 8 compatibility mode, while `splice()`
       * is buggy regardless of mode in IE < 9 and buggy in compatibility mode in IE 9.
       *
       * @memberOf _.support
       * @type Boolean
       */
      support.spliceObjects = (arrayRef.splice.call(object, 0, 1), !object[0]);

      /**
       * Detect lack of support for accessing string characters by index.
       *
       * IE < 8 can't access characters by index and IE 8 can only access
       * characters by index on string literals.
       *
       * @memberOf _.support
       * @type Boolean
       */
      support.unindexedChars = ('x'[0] + Object('x')[0]) != 'xx';

      /**
       * Detect if a DOM node's [[Class]] is resolvable (all but IE < 9)
       * and that the JS engine errors when attempting to coerce an object to
       * a string without a `toString` function.
       *
       * @memberOf _.support
       * @type Boolean
       */
      try {
        support.nodeClass = !(toString.call(document) == objectClass && !({ 'toString': 0 } + ''));
      } catch(e) {
        support.nodeClass = true;
      }
    }(1));

    /*--------------------------------------------------------------------------*/

    /**
     * The template used to create iterator functions.
     *
     * @private
     * @param {Object} data The data object used to populate the text.
     * @returns {String} Returns the interpolated text.
     */
    var iteratorTemplate = function(obj) {

      var __p = 'var index, iterable = ' +
      (obj.firstArg) +
      ', result = ' +
      (obj.init) +
      ';\nif (!iterable) return result;\n' +
      (obj.top) +
      ';';
       if (obj.array) {
      __p += '\nvar length = iterable.length; index = -1;\nif (' +
      (obj.array) +
      ') {  ';
       if (support.unindexedChars) {
      __p += '\n  if (isString(iterable)) {\n    iterable = iterable.split(\'\')\n  }  ';
       }
      __p += '\n  while (++index < length) {\n    ' +
      (obj.loop) +
      ';\n  }\n}\nelse {  ';
       } else if (support.nonEnumArgs) {
      __p += '\n  var length = iterable.length; index = -1;\n  if (length && isArguments(iterable)) {\n    while (++index < length) {\n      index += \'\';\n      ' +
      (obj.loop) +
      ';\n    }\n  } else {  ';
       }

       if (support.enumPrototypes) {
      __p += '\n  var skipProto = typeof iterable == \'function\';\n  ';
       }

       if (support.enumErrorProps) {
      __p += '\n  var skipErrorProps = iterable === errorProto || iterable instanceof Error;\n  ';
       }

          var conditions = [];    if (support.enumPrototypes) { conditions.push('!(skipProto && index == "prototype")'); }    if (support.enumErrorProps)  { conditions.push('!(skipErrorProps && (index == "message" || index == "name"))'); }

       if (obj.useHas && obj.useKeys) {
      __p += '\n  var ownIndex = -1,\n      ownProps = objectTypes[typeof iterable] && keys(iterable),\n      length = ownProps ? ownProps.length : 0;\n\n  while (++ownIndex < length) {\n    index = ownProps[ownIndex];\n';
          if (conditions.length) {
      __p += '    if (' +
      (conditions.join(' && ')) +
      ') {\n  ';
       }
      __p += 
      (obj.loop) +
      ';    ';
       if (conditions.length) {
      __p += '\n    }';
       }
      __p += '\n  }  ';
       } else {
      __p += '\n  for (index in iterable) {\n';
          if (obj.useHas) { conditions.push("hasOwnProperty.call(iterable, index)"); }    if (conditions.length) {
      __p += '    if (' +
      (conditions.join(' && ')) +
      ') {\n  ';
       }
      __p += 
      (obj.loop) +
      ';    ';
       if (conditions.length) {
      __p += '\n    }';
       }
      __p += '\n  }    ';
       if (support.nonEnumShadows) {
      __p += '\n\n  if (iterable !== objectProto) {\n    var ctor = iterable.constructor,\n        isProto = iterable === (ctor && ctor.prototype),\n        className = iterable === stringProto ? stringClass : iterable === errorProto ? errorClass : toString.call(iterable),\n        nonEnum = nonEnumProps[className];\n      ';
       for (k = 0; k < 7; k++) {
      __p += '\n    index = \'' +
      (obj.shadowedProps[k]) +
      '\';\n    if ((!(isProto && nonEnum[index]) && hasOwnProperty.call(iterable, index))';
              if (!obj.useHas) {
      __p += ' || (!nonEnum[index] && iterable[index] !== objectProto[index])';
       }
      __p += ') {\n      ' +
      (obj.loop) +
      ';\n    }      ';
       }
      __p += '\n  }    ';
       }

       }

       if (obj.array || support.nonEnumArgs) {
      __p += '\n}';
       }
      __p += 
      (obj.bottom) +
      ';\nreturn result';

      return __p
    };

    /** Reusable iterator options for `assign` and `defaults` */
    var defaultsIteratorOptions = {
      'args': 'object, source, guard',
      'top':
        'var args = arguments,\n' +
        '    argsIndex = 0,\n' +
        "    argsLength = typeof guard == 'number' ? 2 : args.length;\n" +
        'while (++argsIndex < argsLength) {\n' +
        '  iterable = args[argsIndex];\n' +
        '  if (iterable && objectTypes[typeof iterable]) {',
      'loop': "if (typeof result[index] == 'undefined') result[index] = iterable[index]",
      'bottom': '  }\n}'
    };

    /** Reusable iterator options shared by `each`, `forIn`, and `forOwn` */
    var eachIteratorOptions = {
      'args': 'collection, callback, thisArg',
      'top': "callback = callback && typeof thisArg == 'undefined' ? callback : lodash.createCallback(callback, thisArg)",
      'array': "typeof length == 'number'",
      'loop': 'if (callback(iterable[index], index, collection) === false) return result'
    };

    /** Reusable iterator options for `forIn` and `forOwn` */
    var forOwnIteratorOptions = {
      'top': 'if (!objectTypes[typeof iterable]) return result;\n' + eachIteratorOptions.top,
      'array': false
    };

    /*--------------------------------------------------------------------------*/

    /**
     * Creates a function that, when called, invokes `func` with the `this` binding
     * of `thisArg` and prepends any `partialArgs` to the arguments passed to the
     * bound function.
     *
     * @private
     * @param {Function|String} func The function to bind or the method name.
     * @param {Mixed} [thisArg] The `this` binding of `func`.
     * @param {Array} partialArgs An array of arguments to be partially applied.
     * @param {Object} [idicator] Used to indicate binding by key or partially
     *  applying arguments from the right.
     * @returns {Function} Returns the new bound function.
     */
    function createBound(func, thisArg, partialArgs, indicator) {
      var isFunc = isFunction(func),
          isPartial = !partialArgs,
          key = thisArg;

      // juggle arguments
      if (isPartial) {
        var rightIndicator = indicator;
        partialArgs = thisArg;
      }
      else if (!isFunc) {
        if (!indicator) {
          throw new TypeError;
        }
        thisArg = func;
      }

      function bound() {
        // `Function#bind` spec
        // http://es5.github.com/#x15.3.4.5
        var args = arguments,
            thisBinding = isPartial ? this : thisArg;

        if (!isFunc) {
          func = thisArg[key];
        }
        if (partialArgs.length) {
          args = args.length
            ? (args = nativeSlice.call(args), rightIndicator ? args.concat(partialArgs) : partialArgs.concat(args))
            : partialArgs;
        }
        if (this instanceof bound) {
          // ensure `new bound` is an instance of `func`
          thisBinding = createObject(func.prototype);

          // mimic the constructor's `return` behavior
          // http://es5.github.com/#x13.2.2
          var result = func.apply(thisBinding, args);
          return isObject(result) ? result : thisBinding;
        }
        return func.apply(thisBinding, args);
      }
      return bound;
    }

    /**
     * Creates compiled iteration functions.
     *
     * @private
     * @param {Object} [options1, options2, ...] The compile options object(s).
     *  array - A string of code to determine if the iterable is an array or array-like.
     *  useHas - A boolean to specify using `hasOwnProperty` checks in the object loop.
     *  useKeys - A boolean to specify using `_.keys` for own property iteration.
     *  args - A string of comma separated arguments the iteration function will accept.
     *  top - A string of code to execute before the iteration branches.
     *  loop - A string of code to execute in the object loop.
     *  bottom - A string of code to execute after the iteration branches.
     * @returns {Function} Returns the compiled function.
     */
    function createIterator() {
      var data = getObject();

      // data properties
      data.shadowedProps = shadowedProps;
      // iterator options
      data.array = data.bottom = data.loop = data.top = '';
      data.init = 'iterable';
      data.useHas = true;
      data.useKeys = !!keys;

      // merge options into a template data object
      for (var object, index = 0; object = arguments[index]; index++) {
        for (var key in object) {
          data[key] = object[key];
        }
      }
      var args = data.args;
      data.firstArg = /^[^,]+/.exec(args)[0];

      // create the function factory
      var factory = Function(
          'errorClass, errorProto, hasOwnProperty, isArguments, isArray, ' +
          'isString, keys, lodash, objectProto, objectTypes, nonEnumProps, ' +
          'stringClass, stringProto, toString',
        'return function(' + args + ') {\n' + iteratorTemplate(data) + '\n}'
      );

      releaseObject(data);

      // return the compiled function
      return factory(
        errorClass, errorProto, hasOwnProperty, isArguments, isArray,
        isString, keys, lodash, objectProto, objectTypes, nonEnumProps,
        stringClass, stringProto, toString
      );
    }

    /**
     * Creates a new object with the specified `prototype`.
     *
     * @private
     * @param {Object} prototype The prototype object.
     * @returns {Object} Returns the new object.
     */
    function createObject(prototype) {
      return isObject(prototype) ? nativeCreate(prototype) : {};
    }
    // fallback for browsers without `Object.create`
    if  (!nativeCreate) {
      var createObject = function(prototype) {
        if (isObject(prototype)) {
          noop.prototype = prototype;
          var result = new noop;
          noop.prototype = null;
        }
        return result || {};
      };
    }

    /**
     * Used by `escape` to convert characters to HTML entities.
     *
     * @private
     * @param {String} match The matched character to escape.
     * @returns {String} Returns the escaped character.
     */
    function escapeHtmlChar(match) {
      return htmlEscapes[match];
    }

    /**
     * Gets the appropriate "indexOf" function. If the `_.indexOf` method is
     * customized, this method returns the custom method, otherwise it returns
     * the `basicIndexOf` function.
     *
     * @private
     * @returns {Function} Returns the "indexOf" function.
     */
    function getIndexOf(array, value, fromIndex) {
      var result = (result = lodash.indexOf) === indexOf ? basicIndexOf : result;
      return result;
    }

    /**
     * Creates a function that juggles arguments, allowing argument overloading
     * for `_.flatten` and `_.uniq`, before passing them to the given `func`.
     *
     * @private
     * @param {Function} func The function to wrap.
     * @returns {Function} Returns the new function.
     */
    function overloadWrapper(func) {
      return function(array, flag, callback, thisArg) {
        // juggle arguments
        if (typeof flag != 'boolean' && flag != null) {
          thisArg = callback;
          callback = !(thisArg && thisArg[flag] === array) ? flag : undefined;
          flag = false;
        }
        if (callback != null) {
          callback = lodash.createCallback(callback, thisArg);
        }
        return func(array, flag, callback, thisArg);
      };
    }

    /**
     * A fallback implementation of `isPlainObject` which checks if a given `value`
     * is an object created by the `Object` constructor, assuming objects created
     * by the `Object` constructor have no inherited enumerable properties and that
     * there are no `Object.prototype` extensions.
     *
     * @private
     * @param {Mixed} value The value to check.
     * @returns {Boolean} Returns `true`, if `value` is a plain object, else `false`.
     */
    function shimIsPlainObject(value) {
      var ctor,
          result;

      // avoid non Object objects, `arguments` objects, and DOM elements
      if (!(value && toString.call(value) == objectClass) ||
          (ctor = value.constructor, isFunction(ctor) && !(ctor instanceof ctor)) ||
          (!support.argsClass && isArguments(value)) ||
          (!support.nodeClass && isNode(value))) {
        return false;
      }
      // IE < 9 iterates inherited properties before own properties. If the first
      // iterated property is an object's own property then there are no inherited
      // enumerable properties.
      if (support.ownLast) {
        forIn(value, function(value, key, object) {
          result = hasOwnProperty.call(object, key);
          return false;
        });
        return result !== false;
      }
      // In most environments an object's own properties are iterated before
      // its inherited properties. If the last iterated property is an object's
      // own property then there are no inherited enumerable properties.
      forIn(value, function(value, key) {
        result = key;
      });
      return result === undefined || hasOwnProperty.call(value, result);
    }

    /**
     * Used by `unescape` to convert HTML entities to characters.
     *
     * @private
     * @param {String} match The matched character to unescape.
     * @returns {String} Returns the unescaped character.
     */
    function unescapeHtmlChar(match) {
      return htmlUnescapes[match];
    }

    /*--------------------------------------------------------------------------*/

    /**
     * Checks if `value` is an `arguments` object.
     *
     * @static
     * @memberOf _
     * @category Objects
     * @param {Mixed} value The value to check.
     * @returns {Boolean} Returns `true`, if the `value` is an `arguments` object, else `false`.
     * @example
     *
     * (function() { return _.isArguments(arguments); })(1, 2, 3);
     * // => true
     *
     * _.isArguments([1, 2, 3]);
     * // => false
     */
    function isArguments(value) {
      return toString.call(value) == argsClass;
    }
    // fallback for browsers that can't detect `arguments` objects by [[Class]]
    if (!support.argsClass) {
      isArguments = function(value) {
        return value ? hasOwnProperty.call(value, 'callee') : false;
      };
    }

    /**
     * Checks if `value` is an array.
     *
     * @static
     * @memberOf _
     * @category Objects
     * @param {Mixed} value The value to check.
     * @returns {Boolean} Returns `true`, if the `value` is an array, else `false`.
     * @example
     *
     * (function() { return _.isArray(arguments); })();
     * // => false
     *
     * _.isArray([1, 2, 3]);
     * // => true
     */
    var isArray = nativeIsArray || function(value) {
      return value ? (typeof value == 'object' && toString.call(value) == arrayClass) : false;
    };

    /**
     * A fallback implementation of `Object.keys` which produces an array of the
     * given object's own enumerable property names.
     *
     * @private
     * @type Function
     * @param {Object} object The object to inspect.
     * @returns {Array} Returns a new array of property names.
     */
    var shimKeys = createIterator({
      'args': 'object',
      'init': '[]',
      'top': 'if (!(objectTypes[typeof object])) return result',
      'loop': 'result.push(index)'
    });

    /**
     * Creates an array composed of the own enumerable property names of `object`.
     *
     * @static
     * @memberOf _
     * @category Objects
     * @param {Object} object The object to inspect.
     * @returns {Array} Returns a new array of property names.
     * @example
     *
     * _.keys({ 'one': 1, 'two': 2, 'three': 3 });
     * // => ['one', 'two', 'three'] (order is not guaranteed)
     */
    var keys = !nativeKeys ? shimKeys : function(object) {
      if (!isObject(object)) {
        return [];
      }
      if ((support.enumPrototypes && typeof object == 'function') ||
          (support.nonEnumArgs && object.length && isArguments(object))) {
        return shimKeys(object);
      }
      return nativeKeys(object);
    };

    /**
     * A function compiled to iterate `arguments` objects, arrays, objects, and
     * strings consistenly across environments, executing the `callback` for each
     * element in the `collection`. The `callback` is bound to `thisArg` and invoked
     * with three arguments; (value, index|key, collection). Callbacks may exit
     * iteration early by explicitly returning `false`.
     *
     * @private
     * @type Function
     * @param {Array|Object|String} collection The collection to iterate over.
     * @param {Function} [callback=identity] The function called per iteration.
     * @param {Mixed} [thisArg] The `this` binding of `callback`.
     * @returns {Array|Object|String} Returns `collection`.
     */
    var basicEach = createIterator(eachIteratorOptions);

    /**
     * Used to convert characters to HTML entities:
     *
     * Though the `>` character is escaped for symmetry, characters like `>` and `/`
     * don't require escaping in HTML and have no special meaning unless they're part
     * of a tag or an unquoted attribute value.
     * http://mathiasbynens.be/notes/ambiguous-ampersands (under "semi-related fun fact")
     */
    var htmlEscapes = {
      '&': '&amp;',
      '<': '&lt;',
      '>': '&gt;',
      '"': '&quot;',
      "'": '&#39;'
    };

    /** Used to convert HTML entities to characters */
    var htmlUnescapes = invert(htmlEscapes);

    /*--------------------------------------------------------------------------*/

    /**
     * Assigns own enumerable properties of source object(s) to the destination
     * object. Subsequent sources will overwrite property assignments of previous
     * sources. If a `callback` function is passed, it will be executed to produce
     * the assigned values. The `callback` is bound to `thisArg` and invoked with
     * two arguments; (objectValue, sourceValue).
     *
     * @static
     * @memberOf _
     * @type Function
     * @alias extend
     * @category Objects
     * @param {Object} object The destination object.
     * @param {Object} [source1, source2, ...] The source objects.
     * @param {Function} [callback] The function to customize assigning values.
     * @param {Mixed} [thisArg] The `this` binding of `callback`.
     * @returns {Object} Returns the destination object.
     * @example
     *
     * _.assign({ 'name': 'moe' }, { 'age': 40 });
     * // => { 'name': 'moe', 'age': 40 }
     *
     * var defaults = _.partialRight(_.assign, function(a, b) {
     *   return typeof a == 'undefined' ? b : a;
     * });
     *
     * var food = { 'name': 'apple' };
     * defaults(food, { 'name': 'banana', 'type': 'fruit' });
     * // => { 'name': 'apple', 'type': 'fruit' }
     */
    var assign = createIterator(defaultsIteratorOptions, {
      'top':
        defaultsIteratorOptions.top.replace(';',
          ';\n' +
          "if (argsLength > 3 && typeof args[argsLength - 2] == 'function') {\n" +
          '  var callback = lodash.createCallback(args[--argsLength - 1], args[argsLength--], 2);\n' +
          "} else if (argsLength > 2 && typeof args[argsLength - 1] == 'function') {\n" +
          '  callback = args[--argsLength];\n' +
          '}'
        ),
      'loop': 'result[index] = callback ? callback(result[index], iterable[index]) : iterable[index]'
    });

    /**
     * Creates a clone of `value`. If `deep` is `true`, nested objects will also
     * be cloned, otherwise they will be assigned by reference. If a `callback`
     * function is passed, it will be executed to produce the cloned values. If
     * `callback` returns `undefined`, cloning will be handled by the method instead.
     * The `callback` is bound to `thisArg` and invoked with one argument; (value).
     *
     * @static
     * @memberOf _
     * @category Objects
     * @param {Mixed} value The value to clone.
     * @param {Boolean} [deep=false] A flag to indicate a deep clone.
     * @param {Function} [callback] The function to customize cloning values.
     * @param {Mixed} [thisArg] The `this` binding of `callback`.
     * @param- {Array} [stackA=[]] Tracks traversed source objects.
     * @param- {Array} [stackB=[]] Associates clones with source counterparts.
     * @returns {Mixed} Returns the cloned `value`.
     * @example
     *
     * var stooges = [
     *   { 'name': 'moe', 'age': 40 },
     *   { 'name': 'larry', 'age': 50 }
     * ];
     *
     * var shallow = _.clone(stooges);
     * shallow[0] === stooges[0];
     * // => true
     *
     * var deep = _.clone(stooges, true);
     * deep[0] === stooges[0];
     * // => false
     *
     * _.mixin({
     *   'clone': _.partialRight(_.clone, function(value) {
     *     return _.isElement(value) ? value.cloneNode(false) : undefined;
     *   })
     * });
     *
     * var clone = _.clone(document.body);
     * clone.childNodes.length;
     * // => 0
     */
    function clone(value, deep, callback, thisArg, stackA, stackB) {
      var result = value;

      // allows working with "Collections" methods without using their `callback`
      // argument, `index|key`, for this method's `callback`
      if (typeof deep != 'boolean' && deep != null) {
        thisArg = callback;
        callback = deep;
        deep = false;
      }
      if (typeof callback == 'function') {
        callback = (typeof thisArg == 'undefined')
          ? callback
          : lodash.createCallback(callback, thisArg, 1);

        result = callback(result);
        if (typeof result != 'undefined') {
          return result;
        }
        result = value;
      }
      // inspect [[Class]]
      var isObj = isObject(result);
      if (isObj) {
        var className = toString.call(result);
        if (!cloneableClasses[className] || (!support.nodeClass && isNode(result))) {
          return result;
        }
        var isArr = isArray(result);
      }
      // shallow clone
      if (!isObj || !deep) {
        return isObj
          ? (isArr ? slice(result) : assign({}, result))
          : result;
      }
      var ctor = ctorByClass[className];
      switch (className) {
        case boolClass:
        case dateClass:
          return new ctor(+result);

        case numberClass:
        case stringClass:
          return new ctor(result);

        case regexpClass:
          return ctor(result.source, reFlags.exec(result));
      }
      // check for circular references and return corresponding clone
      var initedStack = !stackA;
      stackA || (stackA = getArray());
      stackB || (stackB = getArray());

      var length = stackA.length;
      while (length--) {
        if (stackA[length] == value) {
          return stackB[length];
        }
      }
      // init cloned object
      result = isArr ? ctor(result.length) : {};

      // add array properties assigned by `RegExp#exec`
      if (isArr) {
        if (hasOwnProperty.call(value, 'index')) {
          result.index = value.index;
        }
        if (hasOwnProperty.call(value, 'input')) {
          result.input = value.input;
        }
      }
      // add the source value to the stack of traversed objects
      // and associate it with its clone
      stackA.push(value);
      stackB.push(result);

      // recursively populate clone (susceptible to call stack limits)
      (isArr ? basicEach : forOwn)(value, function(objValue, key) {
        result[key] = clone(objValue, deep, callback, undefined, stackA, stackB);
      });

      if (initedStack) {
        releaseArray(stackA);
        releaseArray(stackB);
      }
      return result;
    }

    /**
     * Creates a deep clone of `value`. If a `callback` function is passed,
     * it will be executed to produce the cloned values. If `callback` returns
     * `undefined`, cloning will be handled by the method instead. The `callback`
     * is bound to `thisArg` and invoked with one argument; (value).
     *
     * Note: This method is loosely based on the structured clone algorithm. Functions
     * and DOM nodes are **not** cloned. The enumerable properties of `arguments` objects and
     * objects created by constructors other than `Object` are cloned to plain `Object` objects.
     * See http://www.w3.org/TR/html5/infrastructure.html#internal-structured-cloning-algorithm.
     *
     * @static
     * @memberOf _
     * @category Objects
     * @param {Mixed} value The value to deep clone.
     * @param {Function} [callback] The function to customize cloning values.
     * @param {Mixed} [thisArg] The `this` binding of `callback`.
     * @returns {Mixed} Returns the deep cloned `value`.
     * @example
     *
     * var stooges = [
     *   { 'name': 'moe', 'age': 40 },
     *   { 'name': 'larry', 'age': 50 }
     * ];
     *
     * var deep = _.cloneDeep(stooges);
     * deep[0] === stooges[0];
     * // => false
     *
     * var view = {
     *   'label': 'docs',
     *   'node': element
     * };
     *
     * var clone = _.cloneDeep(view, function(value) {
     *   return _.isElement(value) ? value.cloneNode(true) : undefined;
     * });
     *
     * clone.node == view.node;
     * // => false
     */
    function cloneDeep(value, callback, thisArg) {
      return clone(value, true, callback, thisArg);
    }

    /**
     *