Added qunit tests for users and followers.

Added some qunit tests in /static/tests/qunit/ for users and followers.
Added qunit tests for posting.

Added a few extra functions for querying posts in the controller since previous functions required user to be logged in. These functions can get posts from any user (including posts from that users followers and those following that user). This commit also has the user and follower files since I forgot to add them last time!