introduce RdfResource; refactor to inherit
introduce RdfResource; refactor to inherit

OpenBEL/openbel-api,nbargnesi/openbel-server,OpenBEL/openbel-api,OpenBEL/openbel-server,OpenBEL/openbel-api,OpenBEL/openbel-server,OpenBEL/openbel-server,nbargnesi/openbel-server,nbargnesi/openbel-server,OpenBEL/openbel-api