Merge pull request #2342 from dingpinglv/Iss5941_WebGLRenderer

Issue #5941: fixed a bug of cc.ClippingNode
Issue #5933: Fixed atlasNode setColor
Merge pull request #2343 from VisualSJ/Renderer

Issue #5933: Fixed atlasNode setColor
Issue #5933: remove cc.p and cc.rect of SkeletonRenderCmdCanvas
Merge pull request #2344 from VisualSJ/Renderer

Issue #5933: remove atlas _setTextureForCanvas setColor
Issue #5933: labelatlas opacity
Merge pull request #2345 from VisualSJ/Renderer

Issue #5933: labelatlas opacity
Update the AUTHORS.txt
Merge branch 'Renderer' of https://github.com/cocos2d/cocos2d-html5 into Iss5941_WebGLRenderer