title: django-channels identify client on reconnect
body: <p>I connect several (anonymous, not logged in) clients via websocket / django-channels (routing.py, consumers.py). When a client reloads the page or reconnects, for whatever reason, he gets a new <code>channel_name</code>. Is there a nice way to identify the reconnecting client as the same client he was on first connect? Is there some kind of identifier?</p>