Dockerizing the app: matching the port number configuration on Dockerfile to the settings and updating Docs

This commit updates the Dockerfile to expose the same default port used by the application when no other
port is used. The Dockerfile was not matching the version.

In addition, adding the steps to how to spawn the depending containers running CouchDB, Kappa and Redis.

*	modified:   Dockerfile
- Updating the exposed port to match the default one in the app.

*	modified:   README.md
- Adding documentation on how to start the depending containers running the other services.