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Added a simple hello world docker run test, docker name prefixes, CI runs docker. #14
Added a simple test that runs a docker container on the target environment
Added north.config.docker_url and north.config.docker_name_prefix to configure the target docker environment
docker_name_prefix has to be used on all containers. All containers need a name and this as prefix. You have to assume that the target docker environment might run other services.
The tests will clean up all container with the configured docker_name_prefix
Also added a the architecture image to readme as a bit of documentation
