Fix mailman encoding convertation code: it will work only on Ruby 1.9
Fix mailman encoding convertation code: it will work only on Ruby 1.9

xuewenfei/jobsworth,rafaspinola/jobsworth,ari/jobsworth,digitalnatives/jobsworth,digitalnatives/jobsworth,webstream-io/jobsworth,digitalnatives/jobsworth,webstream-io/jobsworth,digitalnatives/jobsworth,ari/jobsworth,xuewenfei/jobsworth,xuewenfei/jobsworth,digitalnatives/jobsworth,ari/jobsworth,rafaspinola/jobsworth,webstream-io/jobsworth,rafaspinola/jobsworth,ari/jobsworth,webstream-io/jobsworth,xuewenfei/jobsworth,rafaspinola/jobsworth