title: Filter not working with ion-list
body: <p>i have a list with three dividers (today, this week, later) that i would like to populate with some events. I'am using filter to sort each event for each divider but I can't get it working. It does not filter anything. Any help ? Am I doing something wrong ?</p>
  
  <p>Here is my html:</p>
  
  <pre><code>&lt;ion-view view-title="Évènements à venir"&gt;
    &lt;ion-content has-bouncing="false" has-tabs ="true" has-header="true"&gt;
      &lt;ion-list&gt;
       &lt;div class="item item-calm item-divider"&gt;
      Aujourd'hui ()
    &lt;/div&gt;
      &lt;ion-item class="item item-avatar item-icon-right" ng-click="detail()" ng-repeat="soiree in test | filter:filterDay" type="item-text-wrap" &gt;
          &lt;img src={{}}&gt;
          &lt;h2&gt;{{soiree.name}}&lt;/h2&gt;
          &lt;p&gt;{{soiree.description}}&lt;/p&gt;
          &lt;i class="button icon ion-ios-checkmark-outline"&gt;&lt;/i&gt;
          &lt;ion-option-button class="button-assertive"
                         ng-click="removeSoiree(soiree)"&gt;
        Supprimer
      &lt;/ion-option-button&gt;
      &lt;/ion-item&gt;
       &lt;div class="item item-calm item-divider"&gt;
      Cette semaine ({{soireeWeekNumber}})
    &lt;/div&gt;
    &lt;ion-item class="item item-avatar item-icon-right" ng-repeat="soiree in test | filter:filterWeek" type="item-text-wrap"&gt;
          &lt;img src={{}}&gt;
          &lt;h2&gt;{{soiree.name}}&lt;/h2&gt;
          &lt;p&gt;{{soiree.description}}&lt;/p&gt;
          &lt;i class="button icon ion-ios-checkmark-outline"&gt;&lt;/i&gt;
      &lt;/ion-item&gt;
      &lt;/ion-list&gt;
    &lt;/ion-content&gt;
  &lt;/ion-view&gt;
  </code></pre>
  
  <p>And here is my filter and my controller:</p>
  
  <pre><code>.filter('filterDay', function() {
    return function(item) {
      var currentDate = new Date();
      if (Math.abs(currentDate - item.date) &lt;= 1000*60*60*24) return true
      else return false
      }
  })
  
  .filter('filterWeek', function() {
    return function(item) {
      var currentDate = new Date();
      if (Math.abs(currentDate - item.date) &gt; 1000*60*60*24 &amp;&amp; Math.abs(item.date - currentDate) &lt;= 7*1000*60*60*24) {
       return true
      } else {
       return false
      }}
  })
  
  .filter('filterFurther', function() {
    return function(item) {
      var currentDate = new Date();
      if (Math.abs(item.date - currentDate) &gt;= 7*1000*60*60*24) {
       return true
      } else {
       return false
      }}
  })
  
  .controller('EventsCtrl', function($scope, $state, $ionicLoading, Soirees) {
  
    $scope.soirees = Soirees.all();
    $scope.test = [{papa: 1,date: new Date()},
    {papa: 2,date: new Date()},
    {papa: 3,date: new Date()}]
  
    $scope.detail = function() {
      $state.go('tab.detail')
    }
  })
  </code></pre>