* 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
* 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)
* Enable evaluation blocks to return an NSError describing the failure
* Align all RKAttributeMapping references to RKPropertyMapping
* Cleanup docs
* Add `RKMappingTestExpectationTestCondition` macro for succinctly implementing mapping test evaluation blocks
* Clean up descriptions for better output from Kiwi
* Added error domain and codes specific for the mapper
* Migrated from using an NSString to real NSError objects
* Toned down the verbosity of error output for readability
* Cleaned up comment formatting
* Changed RKAttributeMapping to RKPropertyMapping for better alignment with the realities of the data model
* Add `objectFromFactory:properties:` this may deprecate `objectFromFactory:` in the future.
* Add `insertManagedObjectForEntityForName:inManagedObjectContext:withProperties:`. This helper method creates managed object instances in a given context (defaulting to the main queue context), sets its properties using an optional dictionary, and obtains a permanent `NSManagedObjectID` before returning. This is intended to reduce the boilerplate required to construct managed object factories.
