- added GAF namespace
- remove include guards due to #pragma once
- changed NULL to nullptr in constructors
* changed using cocos2d namespace to define
* changed NULL to nullptr
Merge branch 'gaf_namespace' of https://github.com/SmartCat/Cocos2dxGAFPlayer into SmartCat-gaf_namespace

Conflicts:
	Library/Sources/GAFAnimatedObject.cpp
	Library/Sources/GAFShaderManager.cpp
	Library/Sources/GAFTextureAtlas.cpp
	Library/Sources/TagDefineAnimationFrames.cpp
Merge branch 'SmartCat-gaf_namespace' into release-cocos2dx-3