- finally got three.js compositing and multi pass rendering with blending working !
 * this means #61 is close to implemented (not fully there yet)
 * to disable the "toonshading/outline" just comment this line in the visualEditorView.coffee file : @finalComposer.render() and uncomment composer.render()
 * added a modified/custom additveBlendShader (which does a bit more than that now: compare depth and normal grayscale values etc, should rename it)
 * also reorganized some element in visualEditorView: the main "init()" call is now done within the OnDOmRefresh event handler, so that renderers, composer etc
can get the correct view resolutions right at the start
 * various minor cleanups