DISCO: import human genomic feature coordinates

Get the list of human genes, and their genomic coords, probably from ENSEMBL (or UCSC as an alternative). Make sure we also pull cytogenic band defs.
Make sure to ingest the following features (at minimum):
genes, transcripts, exons, cytogenic bands
Additional awesomeness would be:
proteins

ENSEMBL does not provide GFF3, rather GTF. Do we want to store it that way in the DISCO system, or convert it to GFF3 during ingest?