Fix package linting on Ubuntu 15.10

Report https://news.ycombinator.com/item?id=11093043

   Lintian check results for /home/algo/Descargas/gitlab-ce_8.4.4-ce.0_amd64.deb:
    E: gitlab-ce: maintainer-address-missing GitLab B.V.

While you're at it also change GitLab B.V. => GitLab Inc.

If you need help from Joe at Packagecloud don't be afraid to ask.

/cc @marin @tmaczukin