Removed intermediary mapping to use RDFLib fully

Conflicts:
	moxie/places/importers/rdf_namespaces.py
Better check to handle boolean values
Merge branch 'master' into places-oxpoints-accessibility-information

* master:
  Better check to handle boolean values
  Removed intermediary mapping to use RDFLib fully

Conflicts:
	moxie/places/importers/oxpoints.py
	moxie/places/importers/rdf_namespaces.py