Configure:
_ Change 'localhost' to the hostname of your docker host in
  artifacts/doc/conf/floodmap.xml and artifacts/doc/conf/rivermap.xml
_ Change 'example.com' to the hostname of your docker host plus ':8082' in
  artifacts/doc/conf/conf.xml
_ Add to gwt-client/src/main/webapp/WEB-INF/config.yaml to enable map printing:
  - !dnsMatch
    host: <your-host>
    port: 8081


Build and run:

$ cd docker
$ docker-compose up

The application should now be accessible on your docker host under
port 8080 and path /d4e-river (e.g. http://your-host:8080/d4e-river).
See docker/flys_user_file for credentials.


TODO:
_ Avoid having to change configuration manually
_ Something better than setting framework and http-client to a branch
  explicitly in the Dockerfiles