2007/12/06: (v3.I)
	* Released to CSCI273 class
2007/12/08: (v3.J):
	* "dead" (offscreen) bullets can no longer kill enemies
	* Added "Game Start" screen
	* Added multiple stages (3 so far)
2007/12/08: (v3.K):
	* Fixed bug with new games loading old data
2008/03/23: (v3.L):
	* Added exit option and ESC key on main menu
	* Changed some in-game text