Nave client-applications should be packaged and released as Docker image

[hanswesterbeek]

This will give us deterministic builds. Reasons to do this are described over at 12factor.net

• Provide proof of that working in the test-project
• Add a reference to the readme.
• This will eliminate the need for running a django build-process during deployment.

[hanswesterbeek]

Interesting article: http://michal.karzynski.pl/blog/2015/04/19/packaging-django-applications-as-docker-container-images/