debianize this package

This package only install the www root to system, the package does
not depend on any http servers, but instead recommend nginx | httpd.

After this package is installed, one would have to install fcgiwrap
and nginx (if not installed automatically by recommends), and copy
or link /usr/share/collectd-web/examples/collectd-web.nginx.conf to
/etc/nginx/conf.d/, and reload nginx.