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.
Should the defined bit positions in the `valid_fields` mask be added as constants to the message definition (similar to fi [industrial_msgs/RobotMode.msg](https://github.com/ros-industrial/industrial_core/blob/hydro-devel/industrial_msgs/msg/RobotMode.msg))?