title: Lowercase of object value in array with underscore js
body: <p>Let's say I have this JSON data in a data variable</p>
  
  <pre><code>[{"id":"1","module_id":"1","title":"Test",
    "start_date":"2012-11-12" "end_date":"2012-11-18"},
   {"id":"8","module_id":"1","title":"This is OK",
    "start_date":"2013-01-14","end_date":"2013-01-31"}]
  </code></pre>
  
  <p>How do I use underscore.js to get following result?</p>
  
  <pre><code>[{"id":"1","module_id":"1","title":"test",
    "start_date":"2012-11-12","end_date":"2012-11-18"},
   {"id":"8","module_id":"1","title":"this is ok",
    "start_date":"2013-01-14","end_date":"2013-01-31"}]
  </code></pre>
  
  <p>Can I do this with invoke ?</p>