Added Background image

Removed hard-coded resolution numbers. added a new background image.
added position variables to player
made a static game manager
Merge branch 'adrian' of https://github.com/Chibin/The-Circle into adrian

Conflicts:
	FinalProject/GameManager.cpp
	FinalProject/Images/bg1.bmp
	FinalProject/OpeningScene.cpp
singleton made. new problem: exit is not working