title: Add Custom font in jspdf
body: <p>i want to use custom font such as 'Comic Sans MS' or 'Calibri' font in jsPDF.
  i have found similar question <a href="https://stackoverflow.com/questions/26908266/custom-font-faces-in-jspdf">here</a>,  but mine is not working.
  i already added the latest jspdf. and my code is like below : </p>
  
  <pre><code>        var doc = new jsPDF('p','mm','a4');
  
          doc.addFont('ComicSansMS', 'Comic Sans', 'normal','StandardEncoding');
          doc.setFont('Comic Sans');          
          doc.text(10, 10, "Lorem ipsum dolor sit amet!");
          doc.output('dataurl');
  </code></pre>
  
  <p>but the pdf result's font is still the default font ( not comic sans ).
  and there is no error. Please help...</p>