Change #import to @import statements. Unfortunately drops support for earlier Xcode versions.
Adds custom -hash method for improving performance and accurate when comparing UAFilter objecs.
Adds additional methods and improvements:

- New -setData:sortComparator: and -setData:sortKeyPath:sortOptions: methods for sorting data when setting/replacing.
- New -mergeObjects:sortKeyPath:sortOptions: for maintaining the sort order when merging objects, improves consistency with other set methods.
- New -filteredIndexPathOfObject: and -filteredIndexPathOfObjectWithPrimaryKey: methods for locating objects in a filtered (visible) results set. This is useful as the raw -indexPathOfObject: methods may not match up with your table view / collection view.
- Improve accuracy of section/item change notifications.
Prepare for 1.0.4 release.