Merge pull request #1411 from xingsenma/develop

issue #3510 Javascript compress
issue #3419 change changeDisplayByIndex to changeDisplayWithIndex
issue #3419 change changeDisplayByName to changeDisplayWithName
Closed #3568: Fix a bug of LabelAtlas that it doesn't work when contentScaleFactor sets.
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-html5 into Iss3568_FixLabelAtlasBug
Fixed #3569: Use viewport to clearRect, limit Canvas size for FixedWidth and FixedHeight mode
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-html5 into develop
Fixed #3569: Correct the direction of viewport
Merge pull request #1414 from dingpinglv/Iss3568_FixLabelAtlasBug

Closed #3568: Fixed a bug of LabelAtlas that it doesn't work when contentScaleFactor sets.
Merge pull request #1413 from pandamicro/develop

Fixed #3569: Use viewport to clearRect
issue #3419 add getChildrenCount/getChildByTag/getChildByName  for UIScrollView
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-html5 into develop_20131218