title: In Play 2.1, What to use instead of deprecated PushEnumerator
body: <p>PushEnumerator becomes deprecated in Play framework 2.1-RC.
  The documentation tells me to use Concurrent.broadcast instead. However, I the data I'm pushing is dependent on the user, so I can't broadcast the same data to each user.  </p>
  
  <p>In other words, Concurrent.broadcast will give me one enumerator that connects to many iteratees whereas I need many enumerators connecting to many iteratees.</p>