This image is based on https://registry.hub.docker.com/u/phusion/baseimage, but backported to Ubuntu 13.10. Go to that link for further information of how to use the image.
Code to build it here: https://github.com/keymon/baseimage-docker-ubuntu-13.10
Use it if you want all the beneficts from phusion/baseimage, but you need to use Ubuntu 13.10 (e.p. you want to use an old repository of debs).