Implemented basic status updates.

Status updates of friends are now displayed on the newsfeed, although
friendships still have to be created manually in the database.  Also,
status updates that YOU post don't show up on your feed yet.  Only
status updates of your friends.
Newsfeed now displays current user's status updates.
Moved the friend getting behavior to its own method in the friends app.
Remove some trailing whitespace
Merge branch 'status_updates'