Merge pull request #2390 from dingpinglv/develop

Update the authors and fixed a bug of cc.Node's addChild
Merge pull request #2391 from dingpinglv/develop

Fixed a bug of cc.Node's addChild
fix the arguments bug
Strengthening the judgement
Merge pull request #2392 from joshuastray/ccui_bug

fix the arguments bug
Merge pull request #2396 from VisualSJ/develop-rc

Strengthening the judgement(Reader)
Fixed a bug of renderer that its cache functions doesn't work when a renderTexture has an other renderTexture
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-html5 into develop
Merge pull request #2399 from dingpinglv/Iss2398_RenderTexture

Fixed #2398: Fixed a bug of renderer for renderTexture
[3.1 release] Add change log
Merge branches 'develop' and 'develop' of git://github.com/cocos2d/cocos2d-html5 into develop
Merge pull request #2400 from pandamicro/develop

[3.1 release] Add change log
Fixed a bug of cc.Sprite that its flipped function is incorrect in Canvas