Issue #1615 Modify TileMap and CCGrid.js code for WebGL
Iusse #1615 Modify CCActionCamera.js and CCActionGrid.js for WebGL
Issue #1615 add CCClippingNode.js, all WebGL code of about action and CCMotionStreak.js to framework.
Merge branch 'webgl20' of https://github.com/cocos2d/cocos2d-html5 into iss1615_WebGLRendering
Merge pull request #763 from dingpinglv/Iss1615_WebGLRendering

Issue #1615 add CCClippingNode.js, all WebGL code of about action and CCMotionStreak.js to framework.