optimize
Merge remote-tracking branch 'origin/develop' into optimizeForMobileBrowser
Fix handling of contentScaleFactor != 1

fixes for Sprite, scale9Sprite, and LabelTTF.
performance improvement for contentScaleFactor fix in Sprite.draw
Merge remote-tracking branch 'upstream/develop' into contantScaleFactorFixes
fixed Add clone to cc.ActionProgressTime
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-html5 into FixedAddCloneToActionProgressTimer
Merge pull request #1024 from dingpinglv/FixedAddCloneToActionProgressTimer

Fixed add clone to action progress timer
Fixed bug when use label setString ,the  parameter is not string
Merge pull request #1025 from xingsenma/other

Fixed bug when use label setString ,the  parameter is not string
fixed sync reference of submodules
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-html5 into FixedAddCloneToActionProgressTimer
Merge pull request #1026 from dingpinglv/FixedAddCloneToActionProgressTimer

fixed sync reference of submodules
fixed #2380 updated changelog and authors
Merge pull request #1027 from dingpinglv/Iss2380_V215Release

fixed #2380 updated changelog and authors
Fixed javascript compress
Merge pull request #1028 from xingsenma/other

Fixed javascript compress
fixed #2380 updated reference of submodule
optimize
optimize