title: How to get all objects in the scene from a component?
body: <p>What's the right way to get all objects in a scene, while in a component?</p>
  
  <p>If I need to raycast everything, for example.</p>
  
  <pre><code>AFRAME.registerComponent('foo', {
    init: function () {
      var el = this.el;
      // Get all objects in scene?
    }
  });
  </code></pre>