title: Paperclip photo upload fails in IE8
body: <p>I'm using paperclip to upload image in my app. The validation I've is :</p>
  
  <pre><code> validates_attachment_content_type :image, :content_type =&gt; ['image/jpg','image/jpeg', 'image/png', 'image/tiff', 'image/gif']
  </code></pre>
  
  <p>Everything works well in firefox, chorme and IE9. But in <strong>IE8</strong>, I get an error - 
       "<em>Photos image content type Invalid format !!!</em>"</p>
  
  <p>Any solution or clue is much appreciated.</p>