Working Dockerfile

I create a Dockerfile for kunagi so everybody will be able to install it using docker.
A working container has been pushed to https://registry.hub.docker.com/u/fgrosse/kunagi/

I think this could really help improving the popularity of the project since its now very easy to setup kunagi on any machine that runs docker with two commands (docker pull and docker run).

This docker image uses the I binary war file to install kunagi. At first I tried to build kunagi from source but had some problems with that. I'm going to create a ticket for that later.
You can checkout the container build from source at https://github.com/FGrosse/kunagi/tree/docker/from-source