add Ubuntu Zesty(Ubuntu 17.04-amd64, i586) add Ubuntu Artful(Ubuntu 17.10-amd64)
I'll just rollback it.
Adding this 'debian' subdirectory will allow users to build binary packages using 'dpkg-buildpackage' and related tools. Tested so far on Debian unstable and 9 as well as Ubuntu 17.04 and 17.10 on OpenSuSE Build Service.