$request can not be null
After upgrading to 0.3.0 I have the following error when I try to start the server:

```
$request can not be null - /Ratchet/WebSocket/WsServer.php [76]
```

Here is my code snippet:

```
$loop = Factory::create();
$webSock = new Reactor($loop);
$webSock->listen(8080, '0.0.0.0');
$webServer = new IoServer(
    new WsServer(
        new WampServer(
            $pusher
        )
    ),
    $webSock
);
```

$pusher is a class that implements WampServerInterface

I do not have any issue with Ratchet 0.2.8. Any changes in 0.3.0 that I should know about? I can't find any information in documentation nor here. PHP ver. 5.4.21. Thanks for any help!
