HTML :
----------------------------------
<!doctype html>
<meta charset="utf-8">
<title>Hello world</title>
<body>
<script src="library/plugins/pixi.js/bin/pixi.js"></script>
<script>
//Test that Pixi is working
console.log(PIXI);
</script>
</body>
----------------------------------
If one tests this in mozilla one sees the following in firebug.
Basic download :
pix ice-hello-world.zip