anchor.diff:        <th>Icon</th>
         <td>
           <div class="col-lg-3">
  -          <a href="#" class="thumbnail">
  +          <a href="" class="thumbnail">
               <%= image_tag root_url + 'download/icon/' + @app_version.id.to_s %>
             </a>
           </div>
  
positive.code:       </td>
      </tr>
  
    </tbody>
  </table>
negative.code:     <%# change log %>
      <tr>
        <th>Change Log</th>
        <td><%= f.text_area :change_log, :rows => 10, :size => "24x6" %></td>
      </tr>
  
      <%# download %>
  