Add vagrant configuration

Author: ubermuda

.gitignore

@@ -1,3 +1,4 @@
 vendor/
 bin/
-composer.lock
+composer.lock
+.vagrant

README.md

@@ -40,10 +40,21 @@ Usage
 
 See [the documentation](http://docker-php.readthedocs.org/en/latest/).
 
+Using Vagrant
+-------------
+
+The provisioning included does not run the `composer install` bit, so you'll have to do it yourself:
+
+```
+$ vagrant up --provider=virtualbox
+$ vagrant ssh
+$ cd /vagrant; composer install --dev
+```
+
 Unit Tests
 ----------
 
-Setup the test suite using [Composer](http://getcomposer.org/):
+Setup the test suite using [Composer](http://getcomposer.org/) if not already done:
 
 ```
 $ composer install --dev

Vagrantfile

@@ -0,0 +1,27 @@
+# -*- mode: ruby -*-
+# vi: set ft=ruby :
+
+$script = <<SCRIPT
+locale-gen
+
+apt-get update -y
+apt-get install -y apt-transport-https
+apt-key adv --keyserver hkp://pgp.mit.edu:80 --recv-keys 58118E89F3A912897C070ADBF76221572C52609D
+
+echo "deb https://apt.dockerproject.org/repo debian-jessie main" > /etc/apt/sources.list.d/docker.list
+
+apt-get update -y
+apt-get install -y docker-engine
+
+usermod -G docker vagrant
+
+apt-get install -y php5-cli php5-json
+
+curl -sS https://getcomposer.org/installer | php
+mv composer.phar /usr/local/bin/composer
+SCRIPT
+
+Vagrant.configure(2) do |config|
+    config.vm.box = "debian/jessie64"
+    config.vm.provision 'shell', inline: $script
+end