Update queue.php

This option is already supported in 'Illuminate/Queue/Connectors/IronConnector.php'
Having this option hidden works well only for North America. However for EU having it set to EU servers give 5X boost in network performance with iron.io

app/config/queue.php

@@ -50,6 +50,7 @@ return array(
 
 		'iron' => array(
 			'driver'  => 'iron',
+			'host'    => 'mq-aws-us-east-1.iron.io',
 			'project' => 'your-project-id',
 			'token'   => 'your-token',
 			'queue'   => 'your-queue-name',