Dx100 driver update

Here is a list of major changes and justifications:
* fs100 renamed to motoman_driver and dx100 package deleted - the dx100 is not longer needed.  The fs100 code/driver was made backwards compatible to the dx100.  The fs100 package was renamed to remove any confusion.  The naming follows other vendor meta-packages.  Namespaces and class names were updated to reflect this backward compatibility (i.e changed from fs100 prefixes to motoman).  IMPORTANT: The new driver performance far exceeds the old dx100 performance.  For this reason the dx100 was removed and won't be supported (for future ROS versions).
* launch files updated - These were updated to follow other vendor package conventions.  In addition special launch files were created for each controller (the controllers have different byte order, requiring different ROS nodes).  Arm navigation packages were also updated to take a controller argument.  This argument is used to launch the appropriate robot interface.
* motoplus files update - updated based on files submitted by motoman