Add support for deployment on Docker

[ptitzler]

Similar to what was already done for https://github.com/IBM/MAX-Image-Caption-Generator-Web-App.
Need to take into account IBM/MAX-Image-Caption-Generator-Web-App#58

[ajbozarth]

We declined to dockerize this app since it's already included in any deployment of the model. Is there a reason we would want to support Docker for dev deployments?