Initial support for a docker development environment

To test out:

  cd docker-dev-environment
  ./build-images.sh
  ./services.py start
  ./manage.py syncdb --all
  ./runserver.py
Fixed a couple settings and added celery worker script
Added basic support for testing with docker.

Added settings file for testing with docker.

Added some extra modules needed to test to our Dockerfile.

Fixed apps.videos.share_utils to not access the DB during module
initialization.

Added test script.  Added support for using different settings files
in manage.py

Added script to reset the docker network.  I'm not sure why this is
happening, but I keep needing to do this.
Use the shell to find docker