change version to 2.1.17

Author: Martin Grenfell

plugin/NERD_commenter.vim

@@ -2,7 +2,7 @@
 " File:        NERD_commenter.vim
 " Description: vim global plugin that provides easy code commenting
 " Maintainer:  Martin Grenfell <martin_grenfell at msn dot com>
-" Version:     2.1.16
+" Version:     2.1.17
 " Last Change: 27 June, 2008
 " License:     This program is free software. It comes without any warranty,
 "              to the extent permitted by applicable law. You can redistribute