modified to publish motor info, needs testing
fixes
Made message names similar to dynamixel_msgs stack
Specify arguments with parameters
Multiple pololu boards can be controlled
Added example launch files
Can set motor position using joint name as argument (rather tha channel name)

Needs to be tested on Indigo
Nearly done!
Finished refactoring.

* Can now calibrate servo's
* Can almost send commands to multiple pololu's
Bug fixes and additions
Calibrate min / max values based on pwm because those are the ground truth for servo motors
Gaze, speech, lip syncing and expressions are all working!
Merge pull request #1 from geni-lab/msg_changes

Changes for demo