wip/mediawiki-mode NetBSD

An excerpt from the website:

I took the mediawiki mode from an old copy on wikipedia.org and refactored the code to use internal Emacs url-http libraries. I also added customization and a site alist so that you can easily toggle between different mediawiki sites. Finally, I added a page ring so that by using M-p and M-n in any mediawiki.el buffer, you can go forwards and backwards.