Bump up lodash version to 2.4.1

* _.difference accepts two arrays, this is fixed, possibly this
  https://github.com/lodash/lodash/wiki/Changelog#v230
  broke the current behavior
* added backbone-lodash-monkeypatch. This fixes issues with passing objects
  as predicates (which was introduced in Lodash) to filter, reject, where
  functions
* Backbone.Colleciton.filterWhere monkey-patched also

Change-Id: I945df79e346a233659507dd22c2c2822e78c17b1
Closes-Bug: #1281076
Merge "Bump up lodash version to 2.4.1"