robotic_arm: changed inputs class to use comma::io instead of boost.
robotic_arm: inputs class - removed debugging lines.
snark-ur5-status & snark-ur5-control:  changed tcp code to use comma, minor change for status reading. No behaviour change expected for both apps.
sensors/hokuyo: added hokuyo message data types according to communication specifications.
sensors/hokuyo: remove accidentally added file.