Updates to PMPair
Merge branch 'unit_tests' of github.com:pm-dev/PMUtils into unit_tests
Removing PMPair. One of the foundation collection types is suitable for a collection with only two objects.
Commenting PMOrderedDictionary header.
Working on PMAnimationQueue
Removing PMAnimationQueue in favor of PMAnimationOperation
Finishing up implementation of PMAnimationOperation. Comments and unit tests to follow.
Rewriting PMImageFilmstrip as a UIView subclass rather than a UICollectionView subclass.