Merge pull request #1157 from dingpinglv/Iss2844_RenameVersion

Closed #2844: Rename version 2.1.6 of Cocos2d-html5 to 2.2
Merge branch 'master' of https://github.com/cocos2d/cocos2d-html5 into develop
Merge pull request #1212 from xingsenma/Cocostudio

issue #2828: Improve code for Cocostudio.
issue #2828 use namespace ccs
issue #2828 improve const value.
Closed #3116: fixed xxxRGBAs' four bugs at setCascadeColorEnabled/setCascadeOpacityEnabled functions
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-html5 into Iss3071_xxxRGBA_Bug
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-html5 into develop
Merge pull request #1213 from dingpinglv/Iss3116_xxxRGBA_Bugs

Closed #3116: fixed xxxRGBAs' four bugs at setCascadeColorEnabled/setCascadeOpacityEnabled functions
Merge pull request #1214 from xingsenma/CocoStudio

issue #2828 use namespace ccs for cocostudio
Closed #3117: cc.Node's getBoundingBoxToWorld has been Refactored for Performance
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-html5 into Iss3117_RefactorgetBoundingBoxToWorld
Merge pull request #1215 from dingpinglv/Iss3117_RefactorgetBoundingBoxToWorld

Closed #3117: cc.Node's getBoundingBoxToWorld has been Refactored for Performance
Merge remote-tracking branch 'upstream/develop' into develop
closed #3128: Fix a bug of Sprite that it is not to be set transform dirty when set color and opacity.
issue #2828 delete DragPanel . cc to ccs.
Closed #3120: cc.Assert has been replaced, it is very slow.
Merge pull request #1217 from xingsenma/bug_3128_sprite

closed #3128: Fix a bug of Sprite that it is not to be set transform dirty when set color and opacity.
Merge remote-tracking branch 'upstream/develop' into develop
fixed #3120: replacing cc.Assert for better performance.