Offboard transmitter should receive targets from move_base

[kylc]

Need to set up a base_local_planner node per http://wiki.ros.org/navigation/Tutorials/RobotSetup#Base_Local_Planner_Configuration

[kylc]

We current have a global planner running, but a local planner requires odometry messages. We have three options:

1. Get the odom data from the PX4, perhaps with roscopter
2. Spoof the odom data based on sequential tfs
3. Set up the local planner without odom data, if possible

[kylc]

Looks like the planner can actually function without odom messages. Velocity outputs are on the /cmd_vel topic. This is what the offboard_comm node should be reading.

[kylc]

Fixed as of https://github.com/osurdml/offboard_comm/commit/cf32e529946af6c4ee797edb0b544f0d52d5da7f.