Implementation of Object Mapping 2.0 design:

* Removed RestKit from inheritance hierarchy
  * Mappings are implemented as concrete classes
  * Mapper is much more flexible & powerful
  * Much more robust error handling
  * Serialization is reimplemented as an object mapping operation
  * Added ability to serialize to JSON natively
  * Reworked Core Data integration
  * Simplified the codebase substantially

Code/ObjectMapping/RKObjectSerializer.h

@@ -0,0 +1,31 @@
+//
+//  RKObjectSerializer.h
+//  RestKit
+//
+//  Created by Blake Watters on 5/2/11.
+//  Copyright 2011 Two Toasters. All rights reserved.
+//
+
+#import "RKObjectMapping.h"
+#import "RKObjectMappingOperation.h"
+#import "../Network/RKRequestSerializable.h"
+
+/**
+ Performs a serialization of an object and its relationships back into
+ a dictionary representation according to the mappings specified. The
+ transformed object is then enclosed in an RKRequestSerializable representation
+ that is suitable for inclusion in an RKRequest.
+ */
+@interface RKObjectSerializer : NSObject <RKObjectMappingOperationDelegate, RKObjectFactory> {
+    id _object;
+    RKObjectMapping* _mapping;
+}
+
+@property (nonatomic, readonly) id object;
+@property (nonatomic, readonly) RKObjectMapping* mapping;
+
++ (id)serializerWithObject:(id)object mapping:(RKObjectMapping*)mapping;
+- (id)initWithObject:(id)object mapping:(RKObjectMapping*)mapping;
+- (id<RKRequestSerializable>)serializationForMIMEType:(NSString*)mimeType error:(NSError**)error;
+
+@end