title: Parsing a data feed results in a Invalid Character error in WinJS
body: <p>I am calling the Flickr data feed in WinJS for a Windows 8 Metro App. When I attempt to parse the feed response with JSON.parse, I get an Invalid Character error. Here is my code:</p>
  
  <pre><code>function processPhotos(result)
  {
      var photoData = JSON.parse(result.responseText);
      //bind here
      data.items.forEach(function (item) {
          list.push(item);
      });
  }
  
  function processError(error) {
      console.log(error.message);
  }
  
  WinJS.xhr({ url: "http://api.flickr.com/services/feeds/photos_public.gne?format=json" }).then(processPhotos, processError);
  WinJS.Namespace.define("data", {
      items: groupedItems,
      groups: groupedItems.groups,
      getItemsFromGroup: getItemsFromGroup
  });
  </code></pre>
  
  <p>Result.ResponseText has the expected content.</p>
  
  <p>Does anyone else encounter this?</p>