[wip] Gitlab ci support

This is the wip PR for GitLab CI support in the Development Kit.

After this is merged you get the following extra's:

  1. Running make also install GitLab ci in gitlab-ci subdirectory
  2. Running make update also updates GitLab ci
  3. Running make update-gitlab-ci updates only GitLab ci
  4. Running make gitlab-ci-clean will remove GitLab ci from your system
  5. GitLab and GitLab CI both use the same postgresql database that can be start from the root with foreman start
  6. You can run GitLab and GitLab ci next to each other since GitLab ci is running on port 5000.
  7. Out of the box GitLab ci is configured to run with GitLab from this GDK

There is a big change I forgot something important, please let me know so I can fix it :)

Depends on: https://gitlab.com/gitlab-org/gitlab-ci/merge_requests/16