Ken McClure:  Update to rover tracks.  Adjusted them 1m in the y axis.  Also updated the crash furrow where the rover first drives into.  I made it flatter and smoother for the rover to drive into.
Ken McClure:  Update to rover tracks.  Adjusted the second and third sections to be lower 1m in the y axis
Merge pull request #327 from virtual-world-framework/Ken-Art

Ken McClure:  Update to rover tracks.  Adjusted them 1m in the y axis.  ...