title: call html5 fullscreen api from pixi.js
body: <p>I would like to build a site using pixi.js</p>
  
  <p>Using native html5 code I can call the fullscreen api of the browser by calling the below function <code>onclick</code> </p>
  
  <pre><code>var elem = document.getElementById("myvideo");
  if (elem.requestFullscreen) {
    elem.requestFullscreen();
  } else if (elem.msRequestFullscreen) {
    elem.msRequestFullscreen();
  } else if (elem.mozRequestFullScreen) {
    elem.mozRequestFullScreen();
  } else if (elem.webkitRequestFullscreen) {
    elem.webkitRequestFullscreen();
  }
  </code></pre>
  
  <p>How can I make the screen fullscreen via pixi?  Can anyone give me a sample? </p>