Add genomics-workspace workflow

[mpoelchau]

We want to add a workflow to add a new organism and sequence files to the genomics-workspace app, as part of the organism onboarding workflow.

See also NAL-i5K/genomics-workspace#280

Steps/example commands:

• addorganism : python manage.py addorganism [genus] [species]
• addblast : python manage.py addblast [genus] [species] -t [sequence type] -f [path to fasta file]
• makeblastdb : python manage.py blast_utility [path to fasta file] -m
• populatesequence : python manage.py blast_utility [path to fasta file] -p
• addhmmer : python manage.py addhmmer [genus] [species] -f [path to fasta file]
• make blast is_shown:
  python manage.py blast_shown [path to fasta file] --shown [true/false]

[mpoelchau]

Added in #79, #76, and #74.