Problems with parsing URLs

On OSX 10.7 and Python 2.7 there's a problem with parsing "ws://" URLs using urlparse module that does not support "ws/wss" schemes. A workaround:

```
@classmethod
def _parse_url(cls, url):
    urlparse.uses_netloc.append("ws")
    urlparse.uses_fragment.append("ws")
    urlparse.uses_netloc.append("wss")
    urlparse.uses_fragment.append("wss")
    p = urlparse.urlparse(url)
```
