private function loadContextInitializer(ContainerBuilder $container)
    {
        $definition = new Definition(
            'Behat\GuzzleExtension\Context\Initializer\GuzzleAwareInitializer',
            array(
                new Reference(self::GUZZLE_CLIENT_ID),
                '%guzzle.parameters%',
            )
        );
        $definition->addTag(
            ContextExtension::INITIALIZER_TAG,
            array('priority' => 0)
        );

        $container->setDefinition('guzzle.context_initializer', $definition);
    }