Merge pull request #15 from kunzel/master

[nav_goals_generator] goal generation in any region of interest (specified as polygon)

Closes issue #13.
strands_datacentre: fixing issues with hostname, launch file
placing nodes into scripts dir
python setup
install scripts into bin/
moving common code into library
adding message storage/access
pymongo install instructions update
strands_diagnostics to store diagnostics in datacentre
rename diagnostic message type
Adding rosout logging
filtering on rosout
db to message, no meta
Merge pull request #16 from cburbridge/master

Diagnostics Logging to DB facilities
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