ESTIMOTE-20 Add to Favorites
https://dotcreek.atlassian.net/browse/ESTIMOTE-20
Added
* Backbone.localStorage
* star on header of content page
* Add to favorites or remove from favorites
* Configuration to load favorites
* Content model isFavorite function
https://dotcreek.atlassian.net/browse/ESTIMOTE-20
https://dotcreek.atlassian.net/browse/ESTIMOTE-20
Added:
* Unit tests
* Helpers to test model and collections properties

Fixed:
* Run unit tests with grunt
    grunt test
* Load libraries to run tests

Cleaned:
* Code to run tests
ESTIMOTE-20 Fix display star for favorites
https://dotcreek.atlassian.net/browse/ESTIMOTE-20
Fixes display star for favorites
Merge branch 'develop' of github.com:dotcreek/phonegap-backbone-estimotes into develop