Changed velocity controllers into position controllers.
Added em_3905_ackermann_ctrlr_params.yaml to the repository.
Changed the PID gains for the axle controllers.
The ackermann_controller node is now launched.
Changed joint effort and velocity limits.
Added a joint state controller. The axles are now controlled by joint velocity
controllers. Changed the PID gain values.
Changed em_3905_ros_ctrlr_params.yaml's name to
em_3905_joint_ctrlr_params.yaml.
Cleaned up.
Created ackermann_vehicle.launch.
Created rviz.launch.
Made various changes to the parameters.
Created ackermann_controller.py.
Cleaned up the file.
Changed the names of some shock absorber parameters.
Performed some code clean-up.
Added Ackermann driving command timeout code.
Cleaned up the code that initializes self._joint_dist_div_2 and
self._wheelbase.
Changed some parameter names.
Added the "namespace" argument.
Added the "namespace" argument.