added srv folder to ur_driver
added payload const
created ros service for sending payload to arm
enabled set payload
beautify
moved service definition to ur_msgs, fix typos, add payload bound parameters
make payload bounds parameterizable through parameter server and launch files
added dependency to ur_msgs to meta-package
Merge branch 'hydro-devel' into issue/heavy_payload_rebased
Merge pull request #102 from ipa-fxm/issue/heavy_payload_rebased

[Hydro] Issue/heavy payload rebased