title: jQuery dataTable doesn't show sort icon
body: <p>I am trying to use a jQuery dataTable plugin. The problem is that the sort icon (this arrow which point in which direction data is actual sorted) is not displayed.</p>
  
  <p>My code looks as follows:</p>
  
  <pre><code>$('#example').dataTable({
      "bPaginate": false,
      "bFilter": false,
      "oLanguage": {
          "sInfo": ""
      }
  });
  </code></pre>
  
  <p>and HTML:</p>
  
  <pre><code>&lt;table class="surfClass" cellspacing="1" id="example"&gt;
      &lt;thead&gt;
          &lt;tr&gt;
              &lt;th width="120px"&gt;Name&lt;/th&gt;
              &lt;th width="120px"&gt;The hourly rate (points)&lt;/th&gt;
              &lt;th&gt;Levels of referrals&lt;/th&gt;
              &lt;th&gt;bonuses&lt;/th&gt;
              &lt;th width="70px"&gt;Payout minimum&lt;/th&gt;
          &lt;/tr&gt;
      &lt;/thead&gt;
  &lt;/table&gt;
  </code></pre>