revert back to the original code having artifacts
Fucking bug in WebGL depth stencil texture!

Change to depth stencil renderbuffer, but use extra color texture to encode eye space depth information. The stencil operation will use depth stencil renderbuffer. But the lighting shader will sample and unpack from depth color texture.

Clean up very needed!
Doing clean up...
Merge branch 'multi_depth' into gh-pages

Conflicts:
	core/DeferredRenderer.js