add preliminary build tools for a Mail-in-a-Box PPA

Starting with my dnswl.org modifications to postgrey.

ppa/Vagrantfile

@@ -0,0 +1,11 @@
+# -*- mode: ruby -*-
+# vi: set ft=ruby :
+
+Vagrant.configure("2") do |config|
+  config.vm.box = "ubuntu14.04"
+  config.vm.box_url = "http://cloud-images.ubuntu.com/vagrant/trusty/current/trusty-server-cloudimg-amd64-vagrant-disk1.box"
+
+  config.vm.provision :shell, :inline => <<-SH
+    sudo apt-get update
+SH
+end