Adds support for multi-groups on Motoman Robots

This pull-request adds support for multi-groups on the MOTOMAN ROS package.

This needs the latest version from motoman_driver from @ted-miller

This depends on:
https://github.com/ros-industrial/industrial_core/pull/82

* Succesfully tested on the Motoman SDA10F and on the Motoman SIA10F.
Missing license. Also in:
 * joint_feedback_ex.h
 * joint_traj_pt_full_ex.h
 * joint_feedback_ex_message.h
 * joint_traj_pt_full_ex_message.h
 * generic_joint_trajectory_action2_node.cpp
 * joint_dynamic_trajectory_interface.cpp
 * robot_group.cpp
 * joint_feedback_ex_message.cpp
 * joint_traj_pt_full_ex_message.cpp