WIP: added method to use basic auth to get the wsdl

I'm using the bundle to record SOAP from a server that needs authentication. login/password can be passed in $options to SoapClient, but when recording the wsdl these options are not considered, so I've added that.

Also a Test seems to be failing (already on master), not yet sure what the problem is:

```
PHP Fatal error:  Function 'ns1:getTheFruit' doesn't exist in /home/reto/migros_api/vendor/liip/soap-recorder-bundle/Liip/SoapRecorderBundle/Tests/Helpers/LocalSoapClient.php on line 28
```