Added django.contrib.sites.managers, which contains CurrentSiteManager. Thanks, Ian Holsman

git-svn-id: http://code.djangoproject.com/svn/django/trunk@2959 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/contrib/sites/managers.py

+from django.db import models
+from django.conf import settings
+
+class CurrentSiteManager(models.Manager):
+    "Use this to limit objects to those associated with the current site."
+    def __init__(self, field_name='site')
+        super(SiteLimitManager, self).__init__()
+        self.__lookup = field_name + '__id__exact'
+
+    def get_query_set(self):
+        return super(SiteLimitManager, self).get_query_set().filter(self.__lookup=settings.SITE_ID)