title: Meteor observe changes added callback on server fires on all item
body: <pre><code>Tracker.autorun(function() {
    DATA.find().observeChanges({
      added: function(id, doc) {
         console.log(doc);
      }
    });
  });
  </code></pre>
  
  <p>This code is being called on the server. Every time the meteor server starts, the <code>added</code> function fires for every single item in the database. Is there a way to have the <code>added</code> callback fire only when new items are added?</p>