refined background scrolling
GUNSGUNSGUNSGUNS

I made the guns work cool, with double gun stuff.
add boss assets
add boss to enemy
last
final boss introducted to game
Merge pull request #8 from alexpineda/something

Something
Merge branch 'master' of https://github.com/blackbourna/Jam into sfx

Conflicts:
	shooter/js/Enemy.js
	shooter/js/Guns.js
	shooter/js/Main.js
	shooter/js/Player.js