Merge pull request #2097 from dingpinglv/Iss5805_Async

Fixed #5805: add a utility of string
Issue #586: hexagonal tilemap on Canvas mode can't runAction
Merge pull request #2098 from VisualSJ/develop-rc2-finaly

Issue #586: hexagonal tilemap on Canvas mode can't runAction
Fixed #5805: refactor cc.log for more maintainability
Merge branch 'develop' of git://github.com/cocos2d/cocos2d-html5 into Iss5805_Async