fixed inertia parameters. added imu plugin--not working
changed some physical and collision properties.
Merge pull request #8 from jackal/spourmehr_jackal_sim

Updated URDF with new physical properties.
Add fork of diff_drive_controller.
Changes
0.2.0
Remove changelog entries which were confusing dpkg.
Depend on diff_drive_controller.
0.2.1
Merge remote-tracking branch 'origin/indigo-devel' into indigo-devel