Include full taxonomy in search results view

Search implementation needs to be optimized
Optimizations for full-taxonomy in search results

Added foreign keys to the Otu table to reference each of the taxa levels
Migration populates these on forward migration
Remove name field in Otu - it was being statically defined as the
genus+species, but not necessary.
Add taxonomy columns to CSV download
Update import process to populate additional taxa IDs in Otu objects

Verified clearing and re-importing vertebrates dataset
Merge pull request #33 from NESCent/full_taxonomy_search_results

Include full taxonomy in search results HTML and CSV