553 - Removed welcome screen from NUX
553 - renamed GeneralWalkthroughViewController to LoginViewController
553 - removed unused WPMobileStats constants
#553 - Changed NUX sign in to have unique WPcom/WPorg forms
#553 - removed unnecessary code from LoginViewController
#553 - Renamed method in LoginViewController
#553 - Fixed LoginViewController layout problems on iPad
#553 - Renamed infoButton to helpButton
Merge branch 'develop' into issues/553
Merge branch 'develop' into issues/553
Removed unused code from LoginViewController
Merge branch 'develop' into issues/553
Merge pull request #559 from wordpress-mobile/issues/553

553 - Remove unnecessary screens from NUX sign in