Hide sign up from users coming from CNX
Added a feature test for hiding sign up from CNX users
Changed Sign Up case to match Sign in; Changed specs to conform to new case
Merge pull request #45 from Dantemss/from_cnx

Hide sign up links from CNX users
cleaned up views and styling, changed google+ icon to google icon, don't freak out if somehow users have already agreed to terms before finish registration (I did that somehow)