Add initial implementation of ontology graph
Add initial implementation of ontology graph

sorgerlab/belpy,sorgerlab/indra,johnbachman/belpy,johnbachman/indra,sorgerlab/belpy,sorgerlab/indra,bgyori/indra,johnbachman/belpy,sorgerlab/belpy,johnbachman/indra,bgyori/indra,bgyori/indra,johnbachman/indra,johnbachman/belpy,sorgerlab/indra