Gazebo bridge can control the gazebo model
Ground truth odometry pubisher added to gazebo_bridge
I can now use a ros topic to control the robot in gazebo and
it will pubish odometry information back via a ros topic
I set up rviz to display the odometry successfully.
gazebo_bridge will look for a robot with the same name in gazebo to controll
gazebo.launch now works with the virtual robot
removed referance to p2os from joint state publisher