Add some fast_atof overloads to simplify calling it.
Add another convenience c'tor to aiColorMM.
Add COB test models.
Remove unreferenced member in B3D importer.
git-svn-id: https://assimp.svn.sourceforge.net/svnroot/assimp/trunk@633 67173fc5-114c-0410-ac8e-9d2fd5bffc1f