Added check for loading of .vcg files, which are the old format.  Now gives useful error message.
1.9.31
Fixed bug #659, seg fault on some meshes with materials.

Turns out rviz was assuming that submeshes were not re-used, but assimp does allow for it.
With this change, that is supported and no longer causes a seg-fault.
1.9.32
Merge branch 'groovy-devel' of github.com:ros-visualization/rviz into groovy-devel