Add Vagrantfile for environment to package binary
Add Vagrantfile for environment to package binary

This will have to run on a server at some point, and I think Ubuntu
16.04 is a safe bet, so build in a similar environment, to make sure the
right dynamic libraries are linked, and to be able to test in a similar
environment.

The Vagrant box is not necessary for normal development, only for
building the final artifacts.

ruuda/hoff,ruuda/hoff