Switch to the storyboard revision 2

- Removed the old .xib file and completely moved to the storyboard
approach
- Switched to the storyboard revision 2
- Renamed several files to really reflect their functionality
- (Probably) be able to display all answered Qwizzle successfully
- Those labels in the answered Qwizzle view are added automatically to
the view + scrollable and multi-lines supported
[Another set] Switch to the storyboard revision 2