Containerize LeanSheets so that it can run in a Docker environment

[paulsjv]

As a developer I want to be able to have all my services run as docker containers so that I can run the entire stack on my local machine. I expect to download the docker container from dockerhub that contains the built app and run the command "docker-compose up" and then be able to browse to http://localhost/ and have LeanSheets load in my browser.