[Assignment 2] - Removing UISegmentedControl
[Assignment 2] - introduced UITabBarController; cleaned up 'deal' action to rely on lazy-initialization of the game
[Assignment 1] - Modified CardGame UI to have images
[Assignment 2] - Added SetGameViewController; cleaned up view
[Assignment 2] - Wired up view to flip card action
Refactoring CardMatchingGame

- moving numberOfCardsToMatch to initializer for CardMatchingGame
- removed controller action to set cards to match at runtime