Merge branch 'master' of http://github.com/ixc/mongoengine into v0.4

Conflicts:
	mongoengine/fields.py
	mongoengine/queryset.py

tests/fields.py

@@ -545,6 +545,7 @@ class FieldTest(unittest.TestCase):
         user.save()
         
         user = User.objects(bookmarks__all=[post_1, link_1]).first()
+        print User.objects(bookmarks__all=[post_1, link_1]).explain()
         
         self.assertEqual(user.bookmarks[0], post_1)
         self.assertEqual(user.bookmarks[1], link_1)