title: Circular reference in value argument not supported angular-ui-calendar in IE8 and IE9
body: <p>Have a problem when using angular-ui-calendar.</p>
  
  <p>I end up with a circular reference in value argument not supported when I change route from where the calendar is loaded.</p>
  
  <p>In addition the console is shown error indexOf not supported when the calendar loads.</p>
  
  <p>This error only occurs on IE8 and IE9</p>
  
  <p>In my controller I have
      $scope.eventSources=[[{"start":"2014-03-07T00:00:00Z","title":"Ring Child Services"},   {"start":"2014-03-06T00:00:00Z","title":"Check Up On incident_2"}]];</p>
  
  <p>and in the HTML template</p>
  
  <pre><code>&lt;div ui-calendar="uiConfig.calendar" class="col-sm-11 calendar" ng-model="eventSources"&gt;    &lt;/div&gt;
  </code></pre>
  
  <p>Any ideas would be greatly appreciated.</p>
  
  <p>Thanks</p>