title: UICollectionView delegate is not responding when the UICollectionView is embedded within a UIScrollView
body: <p>I have a <code>UIViewController</code> with a <code>UIScrollView</code>. The top half of the screen contains some labels and text fields. The lower half of the screen is the <code>UICollectionView</code>. The <code>UICollectionView</code> is embedded within the scrollview so that when the user scrolls down they are not limited to a half screen size collection view.</p>
  <p>The collection view is presenting properly and the delegate is set as I've done countless times before.</p>
  <p>I've purposely tested different solutions and if the collection view is added 'directly' to the UIViewController the <code>didSelectItemAtIndex</code> delegate method is called. When the collection view is added to a scrollView within the ViewController I get no response from the delegate method.</p>
  <p>I have checked the Debug View Heirarchy and the ScrollView content size is sufficient to house the entire collectionView. The Debug view also shows the correct view as the <code>UICollectionViewDelegate</code>.</p>
  <p>Any help would be appreciated.</p>