Procfile container to facilitate running packaged jar applications

In cases where you need to run a third party Java app that comes packaged as a `jar`, being able to specify the exact startup command(s) via a `Procfile` is very useful development, and running the via the start command specified in the `Procfile` using [Forego](https://github.com/ddollar/forego) works well when deployed to Cloud Foundry.

An example of this in action is https://github.com/mybytes/personal-data-api.