Removed arteficial dependency on HttpKernel

Symfony\Component\HttpKernel\DependencyInjection\Extension adds enormous external dependencies. If you work with Symfony, you do not notice, but this "Bundle" is other then that, entirely decoupled from any symfony-framework application skeleton.

This works wonderfully, as long as you have an event dispactcher on key "event_dispatcher":
$container->registerExtension(new \Finite\Bundle\FiniteBundle\DependencyInjection\FiniteFiniteExtension());
$loader = new Symfony\Component\DependencyInjection\Loader\XmlFileLoader($container, new \Symfony\Component\Config\FileLocator(__DIR__ . "/configs"));
$loader->load('config.xml');
$container->compile();