Builds a Docker image for running the Ubiquiti UniFi Controller inside of a Docker container.
The base image is from the official Docker library ubuntu:14.04. The default command is to start the UniFi Controller, which was derived from looking at the /etc/init.d/unifi script that the unifi software from Ubiquiti installs in it's Linux package. Added to the cmd line is the '-nodetach' flag so that it runs in forground mode and is the 1st process in the Docker container.
Pull requests welcome!