title: UICollectionView exception in UICollectionViewLayoutAttributes from iOS7
body: <p>I have done a View in CollectionView with CustomLayout. In iOS6 it worked great but iOS7 it throws an exception like this.</p>
  
  <p>Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: </p>
  
  <blockquote>
    <p>'layout attributes for supplementary item at index path ( {length = 2, path = 0 - 0}) changed from CustomSupplementaryAttributes: 0xd1123a0 index path: (NSIndexPath: 0xd112580 {length = 2, path = 0 - 0}); element kind: (identifier); frame = (0 0; 1135.66 45); zIndex = -1;  to CustomSupplementaryAttributes: 0xd583c80 index path: (NSIndexPath: 0xd583c70 {length = 2, path = 0 - 0}); element kind: (identifier); frame = (0 0; 1135.66 45); zIndex = -1;  without invalidating the layout'</p>
  </blockquote>