Update sample environment file.
Add alternative unicorn configuration.
Add nginx configuration.
Temporarily disable SSL for testing deployment.

Once we know that we can serve up content via nginx, we can
re-enable SSL to get that working next.
Create Dockerfile to run nginx web server.
Fix the postinstall for horizon.

Updates the unicorn config.
Separate web server from application server.

Use two docker containers: one running nginx as a reverse proxy
and another running the unicorn application server. Each container
only needs to worry about running a single process (nginx or unicorn)
and we can take advantage of the docker restart policies if either
one fails.