Added new classes to implement (Discussions, Bulletins, Users, Comments)
Note: Content.java is just a base class that for our content
(Discussions/Bulletins)
Implemented PullToRefreshListView, a listView that we can use for
pull-refreshing)
Added error checking for login (so user/password are not null)
Resized and added like/dislike button layouts
Renamed NewsFeedAdapter to NewsFeedArrayAdapter (it's now an array that
can handle content objects)