make Background.js a generic class
background moves horizontally and player moves vertically
vertical bound for background
Infinite horizontal background movement
enemy collision
Added MenuScene.js
Merge branch 'Background' into wes

Conflicts:
	goodgame.html
	js/Player.js
	main.js
Merge branch 'master' of github.com:wesleytsai/goodgame into wes

Conflicts:
	goodgame.html
	main.js
merging Wes and Sae's branches
Merge branch 'master' into engen

Conflicts:
	goodgame.html
	js/Enemy.js
	main.js