Trouble using microevent.js with virtualjoystick.js

index.html.haml

#crawler-js-container
  #crawler-js
:coffeescript
  window.joystick = {};
  ($ document).ready ->
    MicroEvent.mixin VirtualJoystick
    window.joystick = new VirtualJoystick({
      container	: document.getElementById('crawler-js-container'),
      mouseSupport	: true
      })
    window.joystick.bind '_onMove', ->
      console.log 'notified date', date

= javascript_include_tag "virtualjoystick/virtualjoystick.js"
= javascript_include_tag "microevents/microevent-debug.js"

Generated Javascript

  (function() {
    window.joystick = {};

    ($(document)).ready(function() {
      MicroEvent.mixin(VirtualJoystick);
      window.joystick = new VirtualJoystick({
        container: document.getElementById('crawler-js-container'),
        mouseSupport: true
      });
      return window.joystick.bind('_onMove', function() {
        return console.log('notified date', date);
      });
    });

  }).call(this);