refactor: avoid repetition
fix an unreachable bug fix;
Merge pull request #2100 from dingpinglv/Iss5805_Async

Fixed #5805: refactor cc.log for more maintainability
Issue #5781: Fix audio end event issue in closure compile advanced mode
Merge pull request #2101 from pandamicro/develop

Issue #5781: Fix audio end event issue in closure compile advanced mode
Merge pull request #2099 from mutoo/develop

fix an unreachable bug fix: remove listeners in _toAddedListeners;
Issue #5807: CCAudio load file is not incoming parameters
Merge pull request #2102 from VisualSJ/develop-rc3

Issue #5807: CCAudio load file is not incoming parameters
Merge pull request #2095 from layerssss/patch-1

refactor: avoid repetition
Fixed #5805: remove an incorrect jsDoc document
Merge branch 'develop' of git://github.com/cocos2d/cocos2d-html5 into Iss5805_Async
Correct a bug of cc.WebAudio that the stopped state is incorrect.