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
Add front laser accessory to description.
Merge pull request #9 from jackal/front-laser

Add front laser accessory to description.
Add comment about accessory args.
0.3.0
Add dep for joint state controller.
hector gazebo plugin for imu sensor is added