add attribution
--- MacRuby/trunk/sample-macruby/HotCocoa/calculator-macruby.rb 2008-08-03 04:40:03 UTC (rev 393)
+++ MacRuby/trunk/sample-macruby/HotCocoa/calculator-macruby.rb 2008-08-03 04:43:55 UTC (rev 394)
@@ -1,3 +1,6 @@
+#
+# Port of John Lipsky's weblog post: http://blog.elevenworks.com/?p=38
+#
require 'hotcocoa'
include HotCocoa