refactor shared code to helpers (for datasets)
refactor shared code to helpers (for datasets)

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