import_shapefile is not defined

[issackelly]

The import_shapefile function is not defined, and the default /lib/geocoder/us/import/tiger.rb file is not setup for shapefile imports, here is my stab at it, I wasn't sure where this function belonged in the import file, or else I'd just submit a patch (that, and I'm a ruby and a TIGER newbie, so I'm not sure if it's even all correct)

def import_shapefile (file,table)
  if file.match('.shp$')
    insert_shapefile file, table
  elsif file.match('.dbf$')
    insert_dbf file, table
  end
end