Balls can multiply

Added a multiplication item that doubles the amount of balls on the
screen
Merge branch 'master' of https://github.com/kxh337/BrickBreaker

Conflicts:
	Assets/Prefabs/Brick.prefab
	Assets/Scenes/Game Scene.unity
	Library/assetDatabase3
	Library/guidmapper
Merge branch 'master' of https://github.com/kxh337/BrickBreaker

Conflicts:
	Assets/Prefabs/Brick.prefab
	Assets/Scenes/Game Scene.unity
	Library/assetDatabase3
	Library/guidmapper