title: C4Shape, setFrame doesn't change the size of the shape (C4Framework)
body: <p>I'm playing around with C4, and can't seem to figure out why my shapes don't animate. If I create a shape like so:</p>
  
  <pre><code>self.theShape = [C4Shape ellipse:CGRectMake(100, 100, 2, 2)];
  </code></pre>
  
  <p>... and later call</p>
  
  <pre><code>[theShape setFrame:CGRectMake(200, 200, 50,50)];
  </code></pre>
  
  <p>The shape doesn't change size. The implementation suggests that it should, but I'm not seeing it. Is there anything I'm doing wrong? Is it because I'm not updating the canvas?</p>