Merge glaslos' contrib.

CONTRIBUTORS.txt

@@ -135,6 +135,8 @@ Contributors
 
 - David Birdsong, 2013-04-11
 
+- Lukas Rist, 2013-04-18
+
 - Honza Pokorny, 2013-07-23
 
 - Thúlio Costa, 2013-10-31