Issue #2829: refactoring AudioEngine
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-html5 into Iss2829_ImproveAudioCompatibility
Issue #2829: refactoring cc.WebAudioEngine for compatibility
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-html5 into Iss2829_ImproveAudioCompatibility
Merge pull request #1226 from dingpinglv/Iss2829_ImproveAudioCompatibility

Issue #2829: refactoring cc.WebAudioEngine for compatibility