title: Rally: Possible to go deep in a query?
body: <p>I have this code to query the Snapshot Store: </p>
  
  <pre><code>Ext.create('Rally.data.lookback.SnapshotStore',{
          autoLoad: true,
          fetch: ['Iteration','ObjectID','Name','_ItemHierarchy','_UnformattedID'],
          sorters: {property: 'Iteration', direction: 'DESC'},
          filters: query,
          listeners: {
              load: function(store,data,success){
                  console.log("POID ",prefixed_story_children," exploring ",data);
                  if(data[0].data.Iteration.length!=0)
                      me._get_name_of_iteration(data[0].data.Iteration,prefixed_story_children);
                  else{
                      console.log("no iteration for ",prefixed_story_children);
                      me._update_iteration_of_parent(prefixed_story_children,null);
                  }
              }
          }
      });
  </code></pre>
  
  <p>Is it possible to fetch the details of Iteration while querying? For example:</p>
  
  <pre><code>fetch = ['Iteration[Name,_refObjectName,StartDate,EndDate]','Name','FormattedID'].
  </code></pre>
  
  <p>I vaguely remember there was some way I could deep query in Rally that would allow me to do this. I had seen it in one of the sdk versions but can't remember. Does anyone know how to achieve this?</p>