* Reimplemented connection tests to work with `RKConnectionDescription`. Introduced new `RKConnectionTestExpectation` class
* Slimmed down API by removing proxy methods on `RKMappingTest`
* Eliminated `verifiesOnExpect` behavior in favor of using `evaluateExpectation:`
* Ensured compatibility with RKKiwiMatchers
* Migrated the caches to return `NSSet` to eliminate duplicate objects when your cache keys overlap
* Introduced new recursive strategy for building cache keys in `RKInMemoryManagedObjectCache`
* Added support for array cache key values in `RKFetchRequestManagedObjectCache`
* Re-enabled a slew of tests that were disabled during 0.20 development
* Replaces primary key with `RKEntityIdentifier`
* Add support for use of compound keys for object identification
* Refactor `RKConnectionMapping` to `RKConnectionDescription` and add support for connecting with multiple attributes
* Clarify naming of representation key methods to better match naming conventions
* Add type transformation support for object identification
* Greatly expand test coverage for object identification
* Drop the `NSEntityDescription` category
* Simplify the `RKManagedObjectCaching` protocol
* Add compound key support to the Fetch Request and In Memory Cache implementations
* Replace Kiwi with Specta for tests where contexts are helpful for organization
* Rename `defaultValueForMissingAttribute` to `defaultValueForAttribute`
* Renamed RKObjectPaginator to RKPaginator for simplicity
* Removed delegate on paginator in favor of simple success/failure blocks
* Added `willMapDeserializedResponseBlock` for manipulating the response body before mapping begins
* Added support for cancelling an in-progress pagination request
* Reworked execution of relationship connection operations to use dependencies instead of queue suspension.
* Migrates responsibility for connecting relationships from `RKManagedObjectRequestOperation` into `RKManagedObjectResponseMapperOperation`. This ensures that you get a mapped and connected object graph back from the response mapper if you are using it outside of a request operation.
* Add `parentOperation` to managed object mapping data source to establish dependencies.
* RKObjectParameterization now returns an empty dictionary if mapping produces an unmappable representation error (no mappable attributes/relationships found)
* Log errors if request construction results in an NSError and return nil
* Ensure errors are passed back up through object parameterization instead of just returning nil
* Reset the serialization MIME Type registry during RKTestFactory set up to ensure it is in a sane state
* Convert Hamcrest matchers to Expecta in the object mapper tests to fix infinite recursion on test failure (will need to completely phase out Hamcrest soon)
Instead, fall back to treating all URL's as strings for matching purposes and manually performing relative URL testing. Adds `matchesURL:` and `matchesResponse:` methods to `RKResponseDescriptor`.
