composer.json pulls in all of Symfony

[sampart]

Composer simply references symfony/symfony. The reason is that WhiteOctoberCommandBase.php uses Symfony\Bundle\FrameworkBundle\Command\ContainerAwareCommand and the FrameworkBundle isn't a standalone Symfony component.

It would be good to refactor this so that we can pull in individual Symfony components rather than the whole thing. The ones used by QueueBundle at present are:

• Symfony\Component\Console
• Symfony\Component\DependencyInjection
• Symfony\Component\HttpKernel
• Symfony\Component\Config
• Symfony\Component\EventDispatcher
• Symfony\Component\Validator