Update html5 engine
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-js into develop
Upgrade html5 engine
Issue #5907: Add cc.view.g|setTargetDensityDPI
[Cocos2d-JS 3.0 Release] Add docs
node is undefined
Merge pull request #775 from VisualSJ/develop

node is undefined
Issue #5907: Fix issues of cc.formatStr and language constants
Improve docs and update html5 engine
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-js into develop
Merge pull request #776 from pandamicro/develop

Improve docs and update html5 engine