Merge pull request #2547 from dingpinglv/setTransform

Fixed: fixed a bug of cc.LabelTTF that it can't update its string.
Audio compatibility(ip6 plus - safari|wechat, S4 - sogou|qq|uc, mi2s - system|wechat)
Merge branch 'develop' of git://github.com/cocos2d/cocos2d-html5 into develop-3.2
Merge pull request #2548 from VisualSJ/develop-3.2

Develop 3.2
Add webaudio try/catch to prevent error
Merge pull request #2549 from VisualSJ/develop-3.2

Add webaudio try/catch to prevent error
add emptied state (Audio.js)
Fixed: correct a bug of cc.SpriteBatchNode on Canvas mode that the order of its descendants is incorrect.
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-html5 into setTransform
Merge pull request #2550 from VisualSJ/develop-3.2

add emptied state (Audio.js)
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-html5 into setTransform