Updated minimum iOS deployed version from 4.3 to 5.0 - this allows ordered one-to-many relationships.
Clean up iOS 6.0 warnings.

- Added default loading background for taller iPhone 5.
- Removed deprecated "group table background" colour.
- Adjusted view controller to support multiple screen heights.
Fix broken games.

- Two team games now only have 1 winner.
- Any score at or below -500 properly ends the game.

Fixes #33. Fixes #34.