Merging working MVP code to Master.

And now, I...
![](http://media.giphy.com/media/wsEX8uMrTRDoI/giphy.gif)

A user can make new quacks, view quacks, delete quacks individually, and logout from their profile page.

  *Quack routes are now RESTful.
  *Moved all login/logout related routes to sessions.rb
  *Bugbug: Commented out flocking-related code (was throwing errors)
  *Bugfix: Made logout route a post.
  *Bugfix: Quack model now belongs to user, not users

  TODO:
    Implement flocking