Add main menu nib
Add view controller nib
Add window to main menu nib
Misc view controller changes:

- Add UI and outlets/actions to  view controller nib
- Add view controller ivar to app delegate
Update misc storyboard references for 10.9 compatibility

- Info.plist: remove NSMainStoryboardFile and associated key 'Main'; add NSMainNibFile, set to 'MainMenu'
- Remove storyboard reference in Copy Resources build phase