title: $and inside $elemMatch not working in Meteor
body: <p>I have the following query</p>
  
  <pre><code>{
      lessen: {
          $not: {
              $elemMatch: {
                  $and: [
                      {start: {$lt: new Date()}},
                      {eind: {$gt: new Date()}}
                  ]
              }
          }
      }
  }
  </code></pre>
  
  <p>This worked perfectly until I updated to Meteor 0.8. Now it throws <code>Error: Unrecognized operator: $and</code>. Does anyone know how to fix this?</p>