Fix bug in text field automatic capitalization attribute
Fix values of text field autocorrect and autocapitalize

According to:

https://developer.apple.com/library/safari/#documentation/AppleApplications/Reference/SafariHTMLRef/Articles/Attributes.html

The new values for 'autocorrect' are "off" and "on", and the values for
'autocapitalize' are "none" and "sentences".
Use 'SC.none' to test TextFieldView properties
Fix capitalization of input field attributes
Merge pull request #1024 from ianejames/text_field_fixes

Fixes the autocorrect and autocapitalize attributes of SC.TextFieldView for use in iOS Safari (and any other browsers/web views that support it).