title: jsPDF not ignoring div
body: <p>I am trying to ignore a div while exporting to pdf via jsPDF.
  Here is my code:</p>
  
  <p>HTML:</p>
  
  <pre><code>&lt;div id="print-this"&gt;
  &lt;p&gt;Text to print&lt;/p&gt;
    &lt;div id="ignore"&gt;
      &lt;p&gt;Text To ignore&lt;/p&gt;
    &lt;/div&gt;
  &lt;p&gt;More text to print&lt;/p&gt;
  &lt;/div&gt;
  &lt;button id="cmd"&gt;Print&lt;/button&gt;
  </code></pre>
  
  <p>Jquery:</p>
  
  <pre><code>$(function () {
  
    $('#cmd').click(function () {
      var doc = new jsPDF();
      var elementHandler = {
    '#ignore': function (element, renderer) {
      return true;
    }
  };
      doc.addHTML($('#print-this')[0], 15, 15, {
        'background': '#fff',
      }, function() {
        doc.save('sample.pdf');
      });
    });
  }); 
  </code></pre>
  
  <p>Instead of ignoring a specific id it is exporting everything under id="print-this".</p>