Nothing.
Add NomenclaturalRank as a valid TaxonName rank, to be used as root(s).
Cleanup.
Add NomenclaturalRank as a valid TaxonName rank.
Add and test awesome_nested_set for TaxonNames.  Update TaxonName factories to include parents, and renames factories to reflect code.  Sets TaxonName factories to default to Protonym for easier testing.