bổ sung lớp quản lý effect.
sửa các code
sửa code
Merge branch 'master' of https://github.com/vominhnhut/XDPMCode

Conflicts:
	AngryBirdProject/bin/classes.dex
	AngryBirdProject/bin/classes/entities/pack/GameObject.class
	AngryBirdProject/bin/classes/entities/pack/Map.class
	AngryBirdProject/bin/classes/entities/pack/Slingshot.class
	AngryBirdProject/bin/resources.ap_
bổ sung lớp hổ trợ scene, effect,..