Signed the contributors agreement.

CONTRIBUTORS.txt

@@ -67,3 +67,4 @@ Keith Perkins, 2012/06/07
 Flavio Percoco, 2012/06/07
 Wes Turner, 2012/06/07
 Vitaly Babiy, 2012/06/07
+Tayfun Sen, 2012/06/08