stagger not working with slow or fast classes

[soumak77]

In the example below the items should slide in one at a time using the stagger class:

<div class="slideInLeft stagger" ng-repeat="message in home.messages">
  <p>{{ message.$value }}</p>
</div>

Adding the slow or fast class overrides the stagger class. This causes all the items to slide in at the same time.

<div class="slideInLeft stagger slow" ng-repeat="message in home.messages">
  <p>{{ message.$value }}</p>
</div>