Added favorites

We can now favorite questions. These are stored in CLientData in the
SharedPreferences. Also, our API is slowly starting to smell.
Merge branch 'master' of https://github.com/CMPUT301F14T14/Project
Removed extraneous TODO comment.

Because code review.
Merge pull request #129 from linster/master

Favorites to Question
Merge branch 'master' of https://github.com/CMPUT301F14T14/Project into Sort
Fixed sort by Favourite