add more mime types and a script to generate mime.conf (fxies #2579)

From: Stefan Bühler <stbuehler@web.de>

git-svn-id: svn://svn.lighttpd.net/lighttpd/branches/lighttpd-1.4.x@2964 152afb58-edef-0310-8abb-c4023f1b3aa9