title: jquery draggable containment doesn't work if draggable element has transformation applied
body: <p>I'm trying to use <a href="http://jqueryui.com/draggable/#constrain-movement" rel="nofollow">JQuery Draggable</a>'s <code>containment</code> feature but it doesn't seem to work if the object being contained has a transformation applied to it. </p>
  
  <p>JSFiddle example: <a href="http://jsfiddle.net/US2fr/" rel="nofollow">http://jsfiddle.net/US2fr/</a></p>
  
  <p>Does anyone know how I can fix this?</p>