added nedrex package; impoved graph generation; first fixes for must

Dockerfile

docker-compose.yml

docker-django.env

docker-django.env.dev

drugstone/management/commands/import_from_nedrex.py

drugstone/management/commands/make_graphs.py

drugstone/management/commands/populate_db.py

drugstone/management/includes/DatasetLoader.py

drugstone/models.py

drugstone/settings/settings.py

python_nedrex/.editorconfig

python_nedrex/.travis.yml

python_nedrex/AUTHORS.rst

python_nedrex/CONTRIBUTING.rst

python_nedrex/HISTORY.rst

python_nedrex/LICENSE

python_nedrex/MANIFEST.in

python_nedrex/Makefile

python_nedrex/README.rst

python_nedrex/docs/Makefile