* 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.
