Fix missing assignment of family_taxon

Bug causes families to be empty - Nesting would jump straight from
order to genus.
Simple command-line script to test importer synchronously
Catch the case of data but no source

This was an omission but is now in-place.
Also remove dependency on rails URI class for determining if source is
an http or https url
Merge pull request #35 from NESCent/fix_import_bugs

Fix bugs in importer - Families were not handled correctly and omitted sources were not generating warnings