Merge pull request #2 from cocos2d/develop

Merge from trunk
closed #3348 Fix a bug of LabelBMFont's updateDisplayedOpacity
Merge pull request #1297 from xingsenma/develop_bmf

closed #3348 Fix a bug of LabelBMFont's updateDisplayedOpacity
issue #3251 fix bug for layout
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-html5 into develop_eglvew
Merge pull request #1298 from xingsenma/develop_layoutIssue

issue #3251 fix bug for layout
issue #3251 improve code
issue #3251 improve code for cocostudio
Closed #3352: Fixed a WebAudioEngine's bug that it can't turn off the effect's volume.
Merge pull request #1301 from dingpinglv/Iss3352_WebAudioEngineVolume

Closed #3352: Fixed a WebAudioEngine's bug that it can't turn off the effect's volume
Merge pull request #1 from cocos2d/develop

Pull down updates from cocos2d:develop
issue #3251 improve code for cocostudio
issue #3251 add call function for cocostudio action
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-html5 into develop_eglvew
Merge pull request #1302 from xingsenma/develop

issue #3251 improve code for cocostudio
Merge pull request #3 from cocos2d/develop

Merge from trunk
Refactor CCTween's init method

Refactor CCTween's init method
Merge pull request #1303 from WanderWang/develop

Refactor CCTween's init method
Closed #3352: Adding some codes for WebAudioEngine's compatibility.
Merge pull request #1304 from dingpinglv/Iss3352_WebAudioEngineVolume

Closed #3352: Adding some codes for WebAudioEngine's compatibility.