Having trouble getting started
I'm trying to work through the Chat tutorial, however it seems like I'm misisng some code when I do the initial install of Ratchet. I'm currently running on php 5.3.3, although that doesn't appear to be the problem.

Output of my install

```
Using version ^0.2.8 for cboden/ratchet
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
  - Installing symfony/http-foundation (v2.6.12)
    Loading from cache

  - Installing symfony/event-dispatcher (v2.6.12)
    Loading from cache

  - Installing guzzle/common (v3.7.4)
    Loading from cache

  - Installing guzzle/stream (v3.7.4)
    Loading from cache

  - Installing guzzle/parser (v3.7.4)
    Loading from cache

  - Installing guzzle/http (v3.7.4)
    Loading from cache

  - Installing evenement/evenement (v1.0.0)
    Loading from cache

  - Installing react/stream (v0.3.4)
    Loading from cache

  - Installing react/event-loop (v0.3.4)
    Loading from cache

  - Installing react/socket (v0.3.4)
    Loading from cache

  - Installing cboden/ratchet (v0.2.8)
    Loading from cache

symfony/event-dispatcher suggests installing symfony/dependency-injection ()
symfony/event-dispatcher suggests installing symfony/http-kernel ()
react/stream suggests installing react/promise (~1.0)
react/event-loop suggests installing ext-libevent (>=0.0.5)
react/event-loop suggests installing ext-libev (*)
Package guzzle/common is abandoned, you should avoid using it. Use guzzle/guzzle instead.
Package guzzle/stream is abandoned, you should avoid using it. Use guzzle/guzzle instead.
Package guzzle/parser is abandoned, you should avoid using it. Use guzzle/guzzle instead.
Package guzzle/http is abandoned, you should avoid using it. Use guzzle/guzzle instead.
Generating autoload files
```

Although everything appears to be fine here, when I run the chat-server script, I get this error

```
PHP Fatal error:  Class 'Ratchet\Http\HttpServer' not found in /var/www/html/am-site/modules/ChatApp/bin/chat-server.php on line 10
```

I checked in the Ratchet src files, and it looks like I'm missing the entire Http directory. So, I tried pulling it down from github and now get 

```
PHP Catchable fatal error:  Argument 1 passed to Ratchet\Http\HttpServer::__construct() must be an instance of Ratchet\Http\HttpServerInterface, instance of Ratchet\WebSocket\WsServer given, called in /var/www/html/am-site/modules/ChatApp/bin/chat-server.php on line 14 and defined in /var/www/html/am-site/modules/ChatApp/vendor/cboden/ratchet/src/Ratchet/Http/HttpServer.php on line 23
```

Any suggestions as to what I've done wrong?
