Addmin RFR! (this is our previous branch plus the admin and all passing tests :)  )

Your `authorize_user` method doesn't have a bang at the end, so this will throw an "undefined method 'authorize_user!'" error.

You can either rename your method or remove the bang.

Also, since you have the same `authorize_user` method in two controllers, I'd move it to the `ApplicationController` instead.  That way all your controllers can access it, since they all inherit from `ApplicationController`.