[rex-remind101/MZFormSheetController] fixed rotations for `backgroundImageView`.
Merge pull request #118 from rex-remind101/rotation-fixes

[rex-remind101/MZFormSheetController] fixed rotations for `backgroundImageView`.
Only swap screen & keyboard width/height prior to iOS 8. In iOS 8 the keyboard frame and the screen bounds are maintained in a rotation dependant state.
Merge pull request #119 from JoistApp/keyboard_frame_fix

Only swap screen & keyboard width/height prior to iOS 8. In iOS 8 the ke...
Remove iOS 4 check

Remove iOS 4 check, since MZFormSheetController requires either iOS 5.x or above.
Merge pull request #121 from nonamelive/master

Remove iOS 4 check