Add omniauth

* Added haml-rails gem so we can start using haml for our views
* Added omniauth-twitter gem
* Added omniauth-identity gem
* Setup dotenv file by gem installing foreman
Fix omniauth-twitter gem typo
Add omniauth-twitter

* Added home controller and view for landing page
* Added sessions controller to create and destroy sessions
* Added user model to find user by provider and uid or create new user
Add facebook and google auth.  Removed twitter auth.  Created map page