title: Cancel event in fabric.js
body: <p>I'd like to cancel the <code>MouseEvent</code> that is fired on <code>object:moving</code> in fabric.js, to prevent all the actions when some condition is met. I tried to set <code>cancelBubble = true</code> or simply <code>return false;</code> but with no success. Any ideas?</p>
  
  <p>Sample fiddle with some event:
  <a href="http://jsfiddle.net/fabricjs/S9sLu/" rel="nofollow">http://jsfiddle.net/fabricjs/S9sLu/</a></p>