code: function bind(func, thisArg) {
      return arguments.length > 2
        ? createWrapper(func, 17, slice(arguments, 2), null, thisArg)
        : createWrapper(func, 1, null, null, thisArg);
    }
docs: Creates a function that, when called, invokes `func` with the `this`
  binding of `thisArg` and prepends any additional `bind` arguments to those
  provided to the bound function.
  
  @static
  @memberOf _
  @category Functions
  @param {Function} func The function to bind.
  @param {*} [thisArg] The `this` binding of `func`.
  @param {...*} [arg] Arguments to be partially applied.
  @returns {Function} Returns the new bound function.
  @example
  
  var func = function(greeting) {
  return greeting + ' ' + this.name;
  };
  
  func = _.bind(func, { 'name': 'fred' }, 'hi');
  func();
  // => 'hi fred'