title: Array of Arrays with ng-repeat
body: <p>I am trying to show a list grouped by date but the list isn't sorted and I don't know when the date change.
  It's like I have this Json :</p>
  
  <pre><code>list = 
  {name: first, date: 2014-05-21}, {
  {name: second, date: 2014-05-20}, {
  {name: third, date: 2014-05-21}
  </code></pre>
  
  <p>I'd like to make the following html :</p>
  
  <pre><code>&lt;li&gt;&lt;h3&gt;2014-05-21&lt;/h3&gt;
   &lt;ul&gt;
    &lt;li&gt;first&lt;/li&gt;
    &lt;li&gt;third&lt;/li&gt;
   &lt;/ul&gt;
  &lt;/li&gt;
  &lt;li&gt;&lt;h3&gt;2014-05-20&lt;/h3&gt;
   &lt;ul&gt;
   &lt;li&gt;second&lt;/li&gt;
   &lt;/ul&gt;
  &lt;/li&gt;
  </code></pre>
  
  <p>Do you have an idea ?</p>
  
  <p>I tried to make an Array of arrays with two ng-repeat like this :</p>
  
  <pre><code>for (i in list){
   if ($scope.listToShow[list.date] == undefined) {
       $scope.listToShow[list.date] = newArray();
   }
   $scope.listToShow[list.date].push(list[i]); 
  }
  </code></pre>
  
  <p>But I don't success to show this.</p>