[GH-482] user can set its own commands in the cli-config.php file

This issue is created automatically through a Github pull request on behalf of Halleck45:

Url: https://github.com/doctrine/doctrine2/pull/482

Message:

Today we need to edit source to add custom commands. With this minor change, we can add custom commands directly in the cli-config.php file :

````
require_once "app/bootstrap.php";
$helperSet = new \Symfony\Component\Console\Helper\HelperSet(array(
'em' => new \Doctrine\ORM\Tools\Console\Helper\EntityManagerHelper($entityManager)
));

// example here
$commands = array(
new Doctrine\ORM\Tools\Console\Command\LoadDataCommand
);
````