Add Vagrantfile.

Installation procedure for all engines.

As indicated in the TODOs:

- I could not get lunamark working
- you have to know something about Go to get blackfriday to the latest stable, and I don't

 Raise `ReturnNon0` as for some reason it blew in exceptions in the box, which led me to discover that you can't raise a new style class that is not derived from `Exception`.