iOS5 Support for 1st gen iPads

Ran through several games and didn't see any problems. It runs a bit slower on the 1st gen iPad, but that's to be expected on older devices.

Summary of changes:
- Updated GameCenter authentication handler to support iOS5.
- Swapped in DejaVuSansMono font for unicode char support.
- Added code for iOS5 landscape orientation/rotation.
- Removed auto-layout of About VC.