Updated functionality of menu options, save/load/quit/delete in GameManager
Fixed bug with deleteGame Menu option in GameFrame.java
Added setGamePanel(...) method to Game.java so that the gamePanel can be cleared when a user calls the deleteGame() method in GameManager which deletes the current game
Deleted setGamePanel method in Game.java since it didn't help with my problem. Also re-updating GameManager.java
Merge branch 'master' into meghan