Django-international-sites

- Add International Sitemap views and class so that the Sitemap will show the request domain and it is possible to adjust items based on which CountrySite Sitemap is being viewed
- Fix International fieldset view in admin (no double appearances)

- Make using MaxMind GeoIP localization optional in middleware.
- Add management command for downloading and extracting GeoIP library. Can be executed periodically to keep IP localization up to date.
- Option to disable `by_country` or `by_language` manager method and make them return the full queryset instead.
- Update middleware (order) to work nicely with Django i18n language middleware.

Pre-release for testing in test production environments.