add docs
update doc
Merge pull request #517 from pandamicro/master

[Cocos2d-JS] Update forum links
添加Quick三消文章
Merge branch 'master' of https://github.com/chukong/cocos-docs
Merge pull request #519 from rainswan/master

添加Quick三消文章
Merge pull request #518 from Yangtb/master

update doc
Merge pull request #516 from gloryming/master

add docs
[Cocos2d-JS] Improve resolution policy document