Merge pull request #827 from dingpinglv/Iss1615_WebGLRendering

Fixed #1615 sync to master branch and fix bug of setBlendFunc for WebGL
Merge pull request #832 from dingpinglv/Iss1615_WebGLRendering

Fixed #1615 Modify build.xml for WebGL
Rename CCGLProgram.js to ccGLProgram.js
Merge pull request #847 from dingpinglv/Iss1615_WebGLRendering

Fixed #1615 Optimization performance for WebGL, add cc.PngReader and cc.TiffReader for ParticleSystem
Merge branch 'webgl20' of https://github.com/cocos2d/cocos2d-html5 into iss1615_WebGLRendering