Added support for truncating the length of logged request and response bodies via the 'RKLogMaxLength' environment variable to avoid getting hammered with output on the Trace level
Added convenience function for getting a fetch request from an array of fetch request blocks
Add support for spinning the Network Activity Indicator while object request operations are executing. Add notifications for tracking object request operation lifecycle.
Implement support for using dynamic mapping during parameterization with a Request Descriptor. closes #684
Port a few test cases to Expecta syntax
Remove dead delegate
DRY up find or create of destination object within the mapping operation and change `nil` destination object to an error condition instead of an assertion.
Enable support for testing dynamic mappings with RKMappingTest
Add `objectMapping` identity attribute on `RKPropertyMapping` to allow one to traverse the mapping graph from an attribute/relationship back to the parent mapping
Fix bug with dynamic parameterization when the concrete mapping includes a date.

Instead of relying on reference to the RKMapping, which could be dynamic, traverse from the attribute mapping back to its parent to obtain the appropraite date formatter.
Don't throw an exception if doing a simple attribute mapping with a nil data source. closes #1005
Improve assertion error message
Add global __RESTKIT__ define for aiding conditional compilation
Refactored relationship mapping implementation to make it easier to follow and debug
Added assertion to trap very nasty Core Data mapping error in which `existingObjectWithID:error:` returns an object in another context, indicating that the object graph has been poisoned, most likely by obtaining a permanent managed object ID from the wrong context.
Implement support for cancellation and prioritization of response mapping operations using an operation queue global to all object request operations.

* Passes through cancellation from object request operation to HTTP request operation and response mapping operation. closes #993
* Performs all object mapping within an NSOperationQueue to enable constraining of mapping activities.
* Add default mapping queue with concurrency limit of 1 operation.
* Migrate deserialization of the response body into a serial dispatch queue to ensure that only one parse occurs at a time.
Improve docs on success/failure blocks
Update stubbing routines for fetch requests to support copying of fetch request blocks that require parameters to construct a matching URL
Add support for connection mappings to the RKManagedObjectImporter.
Fix bug in which relationship connection operations are not enqueued for `RKMappingOperation` instances whose mapping is an `RKDynamicMapping`