issue #3419 change changeDisplayByIndex to changeDisplayWithIndex
issue #3419 change changeDisplayByName to changeDisplayWithName
issue #3419 add getChildrenCount/getChildByTag/getChildByName  for UIScrollView
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-html5 into develop_20131218
issue #3419  modify read "CCArmature" for SceneReader
issue #3419 change cc.WHITE to cc.white() for UILayout init
issue #3419 add jsonName for ComAttribute.
issue #3419 change "ComAttribute" to "CCComAttribute"
issue #3419 add setName for read component
issue #3419 fix a bug of CCComAudio  that it can not play backgroundMusic correctly.
issue #3419 set purge as a static method for GUIReader and SceneReader
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-html5 into develop_20131218
Merge pull request #1427 from xingsenma/develop

issue #3419 update cocostudio scene to v2.2.2