[Cocos2d-JS] Improve resolution policy document
[Cocos2d-JS] Improve v3 documents
[Cocos2d-JS] Improve getter/setter documents
[Cocos2d-JS] Improve game documents
[Cocos2d-JS] Improve actions documents
Merge pull request #520 from pandamicro/master

[Cocos2d-JS] Improve v3 documents