Added a Vagrant setup to instantly test the formula

Vagrantfile

@@ -0,0 +1,24 @@
+# -*- mode: ruby -*-
+# vi: set ft=ruby :
+
+# Vagrantfile API/syntax version. Don't touch unless you know what you're doing!
+VAGRANTFILE_API_VERSION = "2"
+
+Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
+  config.vm.box = "ubuntu/trusty64"
+  config.vm.hostname = "salt"
+  config.vm.synced_folder "./", "/srv/salt", id: "vagrant-root"
+
+  config.ssh.forward_agent = true
+
+  config.vm.provider :virtualbox do |vb|
+    # Use VBoxManage to customize the VM. For example to change memory:
+    vb.customize ["modifyvm", :id, "--memory", "1024"]
+  end
+  if Vagrant.has_plugin?("vagrant-cachier")
+    config.cache.scope = :box
+  end
+
+  # Set up salt-master and minion
+  config.vm.provision "shell", path: "dev/setup-salt.sh"
+end