title: Implement UIKitDynamics for dragging view off screen
body: <p>I'm trying to figure out implement UIKit Dynamics that are similar to those in Jelly's app (specifically swiping down to drag view off-screen).</p>
  
  <p>See the animation: <a href="http://vimeo.com/83478484">http://vimeo.com/83478484</a> (@1:17)</p>
  
  <p>I understand how UIKit Dynamics work, but don't have a great physics background and therefore am having trouble combing the different behaviors to get the desired result!</p>