title: Animate the addition/deletion of UICollectionViewCells
body: <p>My problem: Find a way, such that when a button is pressed a new colleciton view cell is inserted by an animation of it sliding in from the right side of the screen. </p>
  
  <p>As of right now, I have a button in my view, when it is clicked, adds a new object to my model, then calls reloadData and the new cells just appears on the screen. All I am struggling with is the animation. Any help would be very much appreciated. </p>
  
  <p>Thanks</p>