Updated tokenNamespace URL.


Hello
The URL has changed for the tokenNamespace and, as edent has noted, the soapClient is now https. 

Here are the updated addresses:
```
$this->soapClient = new SoapClient("https://lite.realtime.nationalrail.co.uk/OpenLDBWS/wsdl.aspx",$soapOptions);
$tokenNamespace = "http://thalesgroup.com/RTTI/2013-11-28/Token/types";
```

Thanks
Karl.