[Bf-cycles] Volumetric patch update (now with new shiny bidirectional integrator)

[storm]

Initial hack to respect asymmetric BSDF with smooth normals, still not
understend how it work, but at least objects with diffusion material
looks better now. No other changes except rebasing to latest trunk.

Starting to get more feedback about patch in blenderartist.org forum, as
most principal tasks solved i need better ideas what to do next and
encourage more coders to help with patch. As uusal, any comments and
critiquue very appreciated, here or maybe in that forum
http://blenderartists.org/forum/showthread.php?286358-Volumteric-bidirectional-spectral-patch-need-your-help.
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