Add an option to customize docroot
Currently the contents of new site's docroot are very much hardcoded, including creation of stats and error dirs(may be depends on own error doc option). It would be more flexible to allow to customize it's contents. I will be attaching a patch that changes current behavior to simply copy contents of /conf-custom/docroot to /web directory. Since I don't care of error docs and stats I have disabled them as well.