title: Retrieving a list of records in deepstream.io
body: <p>I'm currently implementing a simple chat in order to learn how to use deepstream.io. Is there an easy way to get an interval from, lets say, a list of records? Imagine the scenario that a user wants to get old chat messages by scrolling back in the history. I could not find anything about this in the documentation, and I have read through the source with no luck. </p>
  
  <p>Is my best bet to work against a database (e.g. RethinkDb) directly or is there an easy way to do it through deepstream?</p>