[ODE] transformed groups - dGeomTransformGroup

[Russ Smith]

> This is a patch to add the dGeomTransformGroup object to the list of
> geometry objects.

hi tim,

i've added your patch to ODE's contrib directory (slightly modified so
that it can live as a separate source file instead of inside geom.cpp).
i've slightly altered your README to explain where to put the files to
compile the GeomTransformGroup in ODE. note that for now but i prefer to
keep GeomTransformGroup separated from the rest of ODE while other
organizational issues with the collision system are resolved.

thanks,
  russ.

-- 
Russell Smith
http://www.q12.org