possible fix for #38. Stores uint8[] fields as binary.
Merge branch 'hydro-devel' of https://github.com/strands-project/ros_datacentre into hydro-devel

Conflicts:
	ros_datacentre/src/ros_datacentre/util.py
Merge branch 'hydro-devel' of https://github.com/strands-project/ros_datacentre into hydro-devel
Merge remote-tracking branch 'upstream/hydro-devel' into hydro-devel
sphinx framework for documentation
sphinx configuration and index
adding processing of source documentation
ready for update to use google docstrings
message store docstrings
docstrings in util module
datacentre documentation for python