Closes#2976, Closes#3017
- Move logic to signup controller
- Add ValidationEngine mixin to signup controller
- Add signup validator with code from clientold login view
- Add signin validator and integrate into signin controller
- Add validation to forgotten controller
- Switch to button action to support hitting enter in text field to submit
- Clear all notifications in notifications.closeAll
- Modify ValidationEngine.validate to not format errors based on option
- Update casper test for signin to wait for notification before trying
to do another signin
