Add a default 'next()' handler, so that this is usable with the regular `http` server.
Add a default 'next()' handler, so that this is usable with the regular `http` server.

TooTallNate/node-cgi,celsoprieto/ISISCGI,celsoprieto/ISISCGI,TooTallNate/node-cgi,celsoprieto/ISISCGI,TooTallNate/node-cgi