Merge branch 'master' of github.com:celery/celery

CONTRIBUTORS.txt

@@ -149,3 +149,5 @@ Ian A Wilson, 2013/10/18
 Daniel M Taub, 2013/10/22
 Matt Wise, 2013/11/06
 Michael Robellard, 2013/11/07
+Vsevolod Kulaga, 2013/11/16
+