feature: docker-compose: first commit

[kfields]

Adds Docker Compose Support

This is more radical than I intended it to be. I had to move traveller into a subdirectory named web because Docker stats all the files in the same directory of the Dockerfile which creates a problem because of docker volume permissions. All of the repos I've seen are structured like this and now I know why. It would be nice if you could create volumes out of the source tree, but where else would they go that would be cross OS compatible? I also looked into running Docker as a different user, etc. All of the alternative solutions seem to have caveats.

Another contentious issue is that I changed the database to use PostgreSQL. I realize this has implications for deployment and I can change it back to MySQL if need be.

This is in competition with #152, the main difference is that it uses an Alpine image and this uses Debian. Please review

[Abdur-rahmaanJ]

@kfields hum no difference supposedly if we are using mysql but better just in case