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.
Adapting the human_aware_velocity to the new topic name and type of the people tracker
Merge branch 'hydro-devel' into people_tracker

Conflicts:
	strands_human_aware_navigation/src/scripts/human_aware_navigation.py
Merge pull request #62 from hawesie/hydro-devel

Renamed ros_datacentre to mongodb_store
Adapting to new people_tracker message.
Merge pull request #63 from cdondrup/people_tracker

Adjustments for People Ttracker