title: Node-webkit notification sound
body: <p>I've made a function for my node-webkit application to trigger a OS X notification. It works perfectly but I wonder if I can set a system or custom sound instead of the classic iPhone boing sound?</p>
  
  <p>I've looked up the official notification API documentation from Mozzila (<a href="https://developer.mozilla.org/en-US/docs/Web/API/notification" rel="noreferrer">https://developer.mozilla.org/en-US/docs/Web/API/notification</a>) and there is no sound option, however maybe node-webkit implanted that function (can't imagine they didn't) but if they did, I can't seem to find any documentation about it.</p>
  
  <p>So my question is, is there a sound option for notifications in node-webkit?</p>
  
  <pre><code>function notif(title ,tekst, url){
      var notice = new Notification(title, {
          body: tekst
      });
  
      notice.onshow = function(evt) {
          setTimeout(function(){notice.close()}, 5000);
      }
  
      notice.onclick = function(evt) {
          gui.Shell.openExternal(url);
          setTimeout(function(){notice.close()}, 1000);
      };
  }
  </code></pre>