Removed default port binding (why is it even necessary if the notebooks are proxied to from another machine inside the same network?) due to it preventing multiple notebook servers being launched
Removed default port binding (why is it even necessary if the notebooks are proxied to from another machine inside the same network?) due to it preventing multiple notebook servers being launched

minrk/dockerspawner,jupyter/dockerspawner,minrk/dockerspawner,jupyter/dockerspawner