Merge pull request #1890 from epantry/add-contributor

adding myself as a contributor

CONTRIBUTORS.txt

@@ -157,3 +157,4 @@ Pepijn de Vos, 2014/01/15
 Dan McGee, 2014/01/27
 Paul Kilgo, 2014/01/28
 Martin Davidsson, 2014/02/08
+Chris Clark, 2014/02/20