Return Backbone Deferred object for persistence methods
Also add fetchExpanded
Add return statements to more persistence methods
Add unit tests for Deferred Object support. Add MockJax for unit testing ajax calls without hitting API.
Add mockjax to all unit tests. All unit tests passing.
Update backbone to 1.5.1 and jQuery to 1.10.1
Merge pull request #78 from stackmob/f/deferred

Return Backbone Deferred object for persistence methods