WIP: more work on the docker structure, still not finished with 4_run

1_base: builds a base image, based on Ubuntu 16.10
2_buildpy: builds two images:
	2a: an image that can build Python 3.6
	2b: an image that contains the built Python 3.6 in /opt/python
3_buildwheels: builds an image to build wheel files, puts them in ../4_run
4_run: the production runtime image, which can't build anything and just runs.

docker/4_run/manage.sh

@@ -0,0 +1,5 @@
+#!/usr/bin/env bash -e
+
+. /data/venv/bin/activate
+cd /data/git/blender-cloud
+python manage.py "$@"