Fix PFSignUpView, PFLogInView layout problems on iOS7, iOS6.
Fix warnings in console when SignUpViewController or LogInViewController are cancelled.
Merge pull request #17 from ParsePlatform/nlutsenko.12082014.warnings

Fix warnings in console when SignUpViewController or LogInViewController are cancelled.
Merge pull request #16 from ParsePlatform/nlutsenko.12082014.keyboard-ios7

Fix PFSignUpView, PFLogInView layout problems on iOS7, iOS6.
ParseUI 1.0.2
Fixed SignUpView layout when Email is used as Username AND Additional field is being used.