added: Colored Specular Highlights (the only supported uvmaps channels that can work with this feature are alpha and bump, due to POV syntax limitations)
not fixed: vertex colors support broken since BMesh.

git-svn-id: https://svn.blender.org/svnroot/bf-extensions/trunk/py/scripts/addons@4455 96b784f8-4ae3-dd11-aff7-0030488c597c