title: Worklight send push notifications without username
body: <p>I want to create an application which have 2 modes: non-logged-in and logged-in (having username).</p>
  
  <p>I want to send push notifications to devices in both modes. The non-logged-in devices should receive notifications such as general announcements, new events, etc. The logged-in mode devices will also receive same notifications and few more.</p>
  
  <p>Now what I want to do is to subscribe the device to receive notifications for non-logged-in mode then once the user logs in to his account from that device I want to unsubscribe the previous non-logged-in notifications.</p>
  
  <p>I've read the answer to this question : <a href="https://stackoverflow.com/questions/20542930/worklight-push-notification-without-user-id">Worklight: Push notification without User ID</a> I think that I can play with <code>onUserSubscribe</code> callback when registering the user and unsubscribe the userId of the persistent cookie. 
  Is this a good idea ? Is there another suggestion ? </p>