Add support for Docker

[oubiwann]

The following needs to be done to be recognized as an official Docker repo

• Add Dockerfile to LFE
  • Test build of LFE Dockerfile
  • Run an app with the Dockerfile, confirm/document usage
  • Run a script with the Dockerfile, confirm/document usage
• Create a new LFE tag/release that has the Dockerfile in it
• Submit a PR adding LFE to docker-library/official-images
• Submit a PR adding LFE to docker-library/docs

Work for this is going in this branch:

• https://github.com/lfe/lfe/tree/docker-support

[oubiwann]

Just submitted a PR for the first portion of this effort. Next steps can occur after the next release of LFE is tagged.

To use docker with LFE now, see the README on the branch here:

• https://github.com/lfe/lfe/tree/docker-support

[rvirding]

This has been fixed.