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/docker-entrypoint.sh

@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+
+if [ ! -f /installed ]; then
+    echo "Installing pillar and pillar-sdk"
+    # TODO: curretly doing pip install -e takes a long time, so we symlink
+    # . /data/venv/bin/activate && pip install -e /data/git/pillar
+    ln -s /data/git/pillar/pillar /data/venv/lib/python2.7/site-packages/pillar
+    # . /data/venv/bin/activate && pip install -e /data/git/attract
+    ln -s /data/git/attract/attract /data/venv/lib/python2.7/site-packages/attract
+    # . /data/venv/bin/activate && pip install -e /data/git/flamenco/packages/flamenco
+    ln -s /data/git/flamenco/packages/flamenco/flamenco/ /data/venv/lib/python2.7/site-packages/flamenco
+    # . /data/venv/bin/activate && pip install -e /data/git/pillar-python-sdk
+    ln -s /data/git/pillar-python-sdk/pillarsdk /data/venv/lib/python2.7/site-packages/pillarsdk
+    touch installed
+fi
+
+if [ "$DEV" = "true" ]; then
+    echo "Running in development mode"
+    cd /data/git/blender-cloud
+    bash /manage.sh runserver --host='0.0.0.0'
+else
+    # Run Apache
+    a2enmod rewrite
+    /usr/sbin/apache2ctl -D FOREGROUND
+fi