support listing the availlable scripts.

js/pixl/server.js

	})
});
app.get('/scripts', function(req, res) {
	var scripts = fs.readdirSync('./data/scripts');
	res.setHeader('Content-Type', 'text/plain');
	res.send(scripts.map(function(s) { return s.slice(0, s.length - 3); }).join("\n"));
});
app.get('/scripts/:name', function(req, res) {
  var file = req.params.name + '.js';
  var dir = './public';