closed #3349: add ClippingNode for canvas mode
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-html5 into develop_eglvew
issue #3349: add ClippingNode for canvas mode
issue #3349: add ClippingNode for canvas mode
Merge pull request #1308 from xingsenma/develop_clipping

closed #3349: add ClippingNode for canvas mode