Fixed #8574 -- Made Sitemap a new-style class

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9052 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/contrib/sitemaps/__init__.py

@@ -33,7 +33,7 @@ def ping_google(sitemap_url=None, ping_url=PING_URL):
     params = urllib.urlencode({'sitemap':url})
     urllib.urlopen("%s?%s" % (ping_url, params))
 
-class Sitemap:
+class Sitemap(object):
     # This limit is defined by Google. See the index documentation at
     # http://sitemaps.org/protocol.php#index.
     limit = 50000