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.
The Puppet Apache module will use the `www.symfony.local` name as part of the virtual host configuration file name (`/etc/apache2/sites-enabled/10-www.symfony.local.conf`) and as the Apache virtual host `ServerName` value.  Using the `www` should allow a developer to add more `apache::vhost` configurations for other subdomains without much issue.  The `symfony.local` value was added to include a `ServerAlias` in the same Apache virtual host configuration which should match the `ServerName` value in the `/etc/apache2/apache2.conf`file which was configured by the Vagrantfile `fqdn` value.

Ultimately, this should allow a developer to update their `/etc/hosts` file (if they wanted to) and choose to use the local domain with or without the `www` and it should still reference the same Apache virtual host.