Added Vagrant configuration cookbook

| Q             | A
| ------------- | ---
| Doc fix?      | no
| New docs?     | yes
| Applies to    | all
| Fixed tickets | n/a

A new cookbook article was added with an example Vagrant configuration that can be used with the Symfony Standard Edition.
I looked over the code again and the `fqdn` Facter value is being used by the apache puppet module to configure the `ServerName` value in the `/etc/apache2/apache2.conf` file.