Update the collada model of Romeo.

The robot parts now have more colors.
The textures on the torso and the head are not handled yet.
The torso and the waist have been separated. The urdf
has been modified accordingly.
Update author.
[romeo_description] Use correct name for sole links.
[romeo_description] Uncomment group all.
[romeo_description] Remove undefined group arms from all.
[romeo_description] Remove dofs values for joint 'waist' in half_sitting.

  * The joint 'waist' is fixed in the urdf, which creates an
    inconsistency between the number of dofs and the joint type.
  * One solution is to retrieve the actuated joints dof values, and
    then compute the free-flyer dof values, such that both feet are on
    the ground (under the strong assumption the robot has two feet and
    that it is standing on a horizontal floor.)