Remove incomplete species name from CSV export

fixes the following reported issue:
"it looks like the scientific name column is just using data from the genus and species fields rather than genus, species, cultivar, and other part of scientific name. All four of those fields should contribute to the scientific name field. If that's not possible, then we need to remove the scientific name field from the export."
Merge pull request #168 from steventlamb/bug/hide_incomplete_species_name

Remove incomplete species name from CSV export