Friendships

Added lots of good stuff.  Friends seem to be working well.  Added login/logout navbar buttons.  Can search through all users on home page.  

The way it's working right now: if you friend someone, that doesn't necessarily mean they friend you back.  We can change that.  I was just keeping it simple for now.  I was thinking comments on a weigh in by Ariel could only be made by users that Ariel has friended.  So if Ursula has friended Ariel, but Ariel hasn't friended her back, Ursula would not be able to leave a comment.