[graphics/ros-ivcon] Import ros-ivcon-0.1.4

ivcon is a mesh conversion utility.
[graphics] Import ros-convex-decomposition-0.1.9

convex_decomposition contains the Convex Mesh Generation Library, by
John Ratcliff. This library is used to auto-generate convex decomposed
meshes for collision and visualization of robot links.

ROS package that wraps (with some patches) the original project:
http://www.amillionpixels.us/ConvexDecomposition.zip