Useful Commands
- rosrun pr2_commandline projector_on
 - rosrun pr2_commandline projector_off
 
(These are particularly useful when an application turns the textured light projector on and does not turn it off when it exits)
- rosrun pr2_commandline spine_height 0.0
 - rosrun pr2_commandline spine_height 0.42
 - rosrun pr2_commandline spine_height 1.0
 
This moves the spine to the desired percentage of its total height.