expand testLoadUrdf so it can recursively search for urdf files to test
expand testLoadUrdf so it can recursively search for urdf files to test

mitdrc/director,openhumanoids/director,openhumanoids/director,patmarion/director,mitdrc/director,manuelli/director,mitdrc/director,manuelli/director,patmarion/director,patmarion/director,openhumanoids/director,mitdrc/director,mitdrc/director,manuelli/director,openhumanoids/director,manuelli/director,manuelli/director,patmarion/director,openhumanoids/director,patmarion/director