ATTX images released on Docker Hub

First versions of Docker images available for testing purposes.

ATTX has released its first versions of component images on DockerHub. Organisation page for ATTX-project is https://hub.docker.com/u/attxproject/. Although these images are a milestone for the project, things are still moving and changing quite fast in the background, so new versions are excepted quite soon. 

For more information about the role of individual components, go to attx-project.github.io