Fix crash when mapping to `NSManagedObject` class with Transformable attribute without a backing property. fixes #1162
Fix crash when serializing `NSDate` properties mapped at nested keypaths. fixes #1134
Fix bug with mapping nested attribute values with identification attributes when the identification attribute is not the nesting key. fixes #1129
Rework implementation of cyclic mapping graph traversal. refs #1142 #1158 #1163
Add test coverage verifying fix for crash during cyclic graph traversal in `RKManagedObjectRequestOperation`. closes #1142