Create a cookbook and test it on Ubuntu 12.04

Runs a cookbook which:
* installs `apache2`, `mysql`, and `php,
* enables `apache_site`,
* creates a `mysql` database,
* adds a user to the database and grants some privileges,
* creates basic webpages at `http://localhost/index.html` and `http://localhost/index.php`.

Then tests that cookbook using Test Kitchen and Serverspec.