GitLab Pipeline for a single commit

We should visualize what is going on in the CI/CD pipeline.

Also see GitLab Deploy

The stages are already listed in the .gitlab-ci.yml file. We should show which commits are currently in which stage, what the status of the individual jobs are and what steps require manual intervention.

Inspiration:

1. Concourse http://ci.concourse.ci/
2. XL Deploy Visual status dashboards https://xebialabs.com/products/xl-deploy/features/#visual-status-dashboards
3. Electriccommander http://electric-cloud.com/blog/2012/06/electriccommander-4-1-expanding-usability-and-visibility/
4. GoCD Pipelines http://howtocookmicroservices.com/docker-continous-delivery-pipeline/
5. Jenkins Delivery Pipeline https://wiki.jenkins-ci.org/display/JENKINS/Delivery+Pipeline+Plugin
6. Jenkins Build Pipeline https://wiki.jenkins-ci.org/display/JENKINS/Build+Pipeline+Plugin

/cc @JobV @dzaporozhets