initial add to version 2.0
Corrects issue with form field rendering and adds place holder text/option to UITextView through SurveyTextView
Adds documentation to headers for appledoc
Adds more documentation
Updates readme for temp status
fixed crash when validating nil values
fixed bug in email validator
Adds ability to change placeholder text color
Fixes issue with placeholder color not updating when color is changed
Adds reseting placeholder color when placeholderColor is set to nil
Fixes changes to placeholders
Adds next field and previous field helpers also corrects error checking
Merge branch '2.0' of github.com:wess/Survey into 2.0
Merge branch 'master' into 2.0