Hits POST auths route when user successfully authenticates through facebook popup

	*Facebook SDK is initialized in application.js.
	*Facebook login button is on login.erb
Facebook login button logs in or creates a user in the database. Success!

	TODO:
		*Merge with master
		*Once logged in, redirect user to a group creation page if they are not already part of a group, and their group if they are
Redirects to group creation page on successful login

  *Displays the user's first name
  *Displays the user's profile picture in very small resolution

  TODO:
    Implement group and listing models and migrations
Merge pull request #2 from dstavis/facebook_login

Facebook login