Pull request from Team Stream

Comments/suggestions related to the app's architecture would be appreciated!
So, along the same vein as the HomeController comments, if you create a TwitterSetter class, now you can use that code here! So instead of having find_provider and create_twitter_client defined here, you can just call ```TwitterSetter.new(session[:user_id])``` and get rid of all the repetitive code in this controller. REFACTORING IS AWESOME.