added service
added visualization via markerarray
commands to build service
switched pan and tilt idxs
Merge branch 'master' of https://github.com/strands-project/strands_utils
Merge branch 'master' of https://github.com/strands-project/strands_utils
changed topic name to /ptu/cmd
Merge branch 'master' of https://github.com/strands-project/strands_utils
Merge pull request #26 from kunzel/master

Visualization of nav_goals; adjusted topic name for the PTU