carsonb/PSCollectionView — pull request #8 by joshpc (2012-11-15 19:08:17+00:00)
Title: Removes a small bit of overhead from using NSNumbers

1) Adds PSCollectionViewKey and uses it instead of NSNumber. NSNumber was slower on comparisons (we can do a simple integer compare)
2) Fixes casting issues (keys were being cast to Strings)