Updated version to 1.4.0.  Includes RDFSER-60 (use of RDF collections when serialising).
Updated version to 1.4.0.  Includes RDFSER-60 (use of RDF collections when serialising).

edmcouncil/rdf-serializer,edmcouncil/rdf-toolkit,edmcouncil/rdf-toolkit,edmcouncil/rdf-serializer,edmcouncil/rdf-toolkit