Fix for a mem leak in CullVisitor, the leafStack was keeping references to old nodes
Adds half float enum
Added a reference to jsperf performance test
Reorganises osgShader

* Adds OSG.osgShader in the build
* Reorganize osgShader/utils
* use a callFunction to call glsl can be verbose with the flag osgShader.debugShaderNode
* use node instead of shaderNode
js beautify osgShader
Merge branch 'develop' of github.com:cedricpinson/osgjs into develop
Merge pull request #147 from jtorresfabra/fix_leaks

Fix for a mem leak in CullVisitor, the leafStack was keeping references ...
Merge remote-tracking branch 'upstream/develop' into develop