now using the same column names as geonames.org
added geonames_alternate_names
bug fixed : bad attributes for admin2
alternate name uniqueness validation
bigger buffer for alternate names import task
GeonamesDump.search :auto --> city, alternate name, admin1, admin2, country, feature
Added GeonamesDump.search() usage
New version 0.0.4 released
Merging release 0.0.4