Use a local lookup table for country bounding boxes rather than relying

on geonames.org being able to do it in a reasonable time.

db/migrate/031_create_countries.rb

@@ -0,0 +1,36 @@
+require 'lib/migrate'
+
+class CreateCountries < ActiveRecord::Migration
+  def self.up
+    create_table :countries, innodb_table do |t|
+      t.column :id,      :integer_pk,              :null => false
+      t.column :code,    :string,     :limit => 2, :null => false
+      t.column :min_lat, :double,                  :null => false
+      t.column :max_lat, :double,                  :null => false
+      t.column :min_lon, :double,                  :null => false
+      t.column :max_lon, :double,                  :null => false
+    end
+
+    add_index :countries, [:code], :name => "countries_code_idx", :unique => true
+
+    Net::HTTP.start('ws.geonames.org') do |http|
+      xml = REXML::Document.new(http.get("/countryInfo").body)
+
+      xml.elements.each("geonames/country") do |ele|
+        code = ele.get_text("countryCode").to_s
+        minlon = ele.get_text("bBoxWest").to_s
+        minlat = ele.get_text("bBoxSouth").to_s
+        maxlon = ele.get_text("bBoxEast").to_s
+        maxlat = ele.get_text("bBoxNorth").to_s
+
+        Country.create(:code => code,
+                       :min_lat => minlat.to_f, :max_lat => maxlat.to_f,
+                       :min_lon => minlon.to_f, :max_lon => maxlon.to_f)
+      end
+    end
+  end
+
+  def self.down
+    drop_table :countries
+  end
+end