title: Angular Bootstrap: data-provide="datepicker" not using format identifier
body: <p>Please consider this <a href="http://plnkr.co/edit/N9l1hyloZezZb7GMjqAH?p=preview" rel="nofollow">Plunk</a>.</p>
  
  <p>I have a controller set up like this:</p>
  
  <pre><code>app.controller("myController", [
        "$scope",
        function($scope){
          $scope.DateFormat = "DD/MM/YYYY";
  
          $scope.From = '15/01/2015'; // DD/MM/YYYY
          $scope.To = '31/12/2015'; // DD/MM/YYYY
        }]);
  </code></pre>
  
  <p>And usage at Html level is:</p>
  
  <pre><code>&lt;input type="text" 
      ng-model="From" 
      data-provide="datepicker" 
      date-format="DateFormat" /&gt;
  </code></pre>
  
  <p>Regardless of the format identifier, the date is provided as <code>MM/DD/YYYY</code>, which would cause errors on the backend.</p>
  
  <p>Any suggestions?</p>