collapse ncbi species fields; just use "species"
collapse ncbi species fields; just use "species"

now biological_context.species is a string type allowing NCBI Taxonomy
id, scientific name, or common name

refs #12

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