title: Get Tumblr posts with certain tags
body: <p>I need to only get tumblr posts which have been tagged with 'diary'</p>
  
  <p>Here is the feed, 'http://clintonbeattie.tumblr.com/api/read/json'</p>
  
  <p>I'm not sure how to loop through the posts and output only the diary ones.</p>
  
  <p>Any help much appreciated.</p>