XML parser compiles
XML loader works
velvet material working
dielectric partially working
glass material works
metallic paint material works in tutorial07
updated C++ version of tutorial06
Merge branch 'devel' of https://github.com/embree/embree into devel
added some inlines to tutorial06_ispc
added matte material to tutorial06
added mirror material to tutorial06
added thindielectric material
added reflective conductor material