Renamed ros_datacentre to mongodb_store

This simply bulk replaces all ros_datacentre strings to mongodb_store strings inside files and also in file names.

Needs strands-project/ros_datacentre#76 to be merged first.
Merge pull request #76 from hawesie/hydro-devel

Renamed ros_datacentre to mongodb_store
Renamed datacentre_ rosparams to mongodb_
scitos_apps_msgs has been removed.
All the imports were unused anyway.
Merge pull request #77 from cdondrup/scitos_apps_msgs

Refactoring: scitos_apps_msgs has been removed.
scitos_ramp_climb is now ramp_climb
Merge pull request #80 from cdondrup/rename

scitos_ramp_climb is now ramp_climb
Merge branch 'hydro-devel' of https://github.com/strands-project/strands_navigation into hydro-devel

Conflicts:
	topological_navigation/scripts/localisation.py
	topological_navigation/scripts/navigation.py