Began simple friends implementation.

Friends, once manually added, are now displayed on the friends page.
Fancier button for registration
Completed 'add friends' functionality.

Friends can be added by inputting their username.  Error messages
are generated if you're already friends with the user or they don't
exist.

There is no concept of a pending friend request.  If one person
adds a friend, they're friends.

Viewing another user's profile has yet to be implemented.
Merge branch 'friends'

Conflicts:
	socialnetwork/templates/base.html
	socialnetwork/urls.py
Add StatusForm model
Change get to post
Fix up viewing of status
Newsfeed urls now go to newsfeed app as well
Finish up liking capability
Merge branch 'liking'
Finish messaging to friends