Overhaul RKParser API's for clarity and simplicity:

* Adds support for NSJSONSerialization. closes #476
* Renames RKParser to RKSerialization
* Renames RKParserRegistry to RKMIMETypeSerialization
* Rework serialization implementations API's to use class methods
* Fold together string and regular expression matching for MIME Type registrations
* Port serialization implementations to working off of NSData instead of NSString. refs #762
* Migrate JSONKit to being an optional component. See https://github.com/RestKit/RKJSONKitSerialization

Code/Support/RKSerialization.h

@@ -0,0 +1,52 @@
+//
+//  RKCoding.h
+//  RestKit
+//
+//  Created by Blake Watters on 10/1/10.
+//  Copyright (c) 2009-2012 RestKit. All rights reserved.
+//
+//  Licensed under the Apache License, Version 2.0 (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
+//
+//  http://www.apache.org/licenses/LICENSE-2.0
+//
+//  Unless required by applicable law or agreed to in writing, software
+//  distributed under the License is distributed on an "AS IS" BASIS,
+//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//  See the License for the specific language governing permissions and
+//  limitations under the License.
+//
+
+/**
+ The RKSerialization protocol declares two methods that a class must implement
+ so that it can provide support for serializing objects to and deserializing objects
+ from UTF-8 encoded data representations of a serialization format such as JSON
+ or XML. Serialization implementations typically handle data in a given MIME Type 
+ (i.e. application/json) and may be registered with the RKCoder class.
+ 
+ @see RKMIMETypeSerialization
+ */
+@protocol RKSerialization <NSObject>
+
+/**
+ Deserializes and returns the given data in the format supported by the receiver
+ (i.e. JSON, XML, etc) as a Foundation object representation.
+ 
+ @param data The UTF-8 encoded data representation of the object to be deserialized.
+ @param error A pointer to an NSError object.
+ @return A Foundation object from the serialized data in data, or nil if an error occurs.
+ */
++ (id)objectFromData:(NSData *)data error:(NSError **)error;
+
+/**
+ Serializes and returns a UTF-8 encoded data representation of the given Foundation
+ object in the format supported by the receiver (i.e. JSON, XML, etc).
+ 
+ @param object The object to be serialized.
+ @param A pointer to an NSError object.
+ @return A data representation of the given object in UTF-8 encoding, or nil if an error occurred.
+ */
++ (NSData *)dataFromObject:(id)object error:(NSError **)error;
+
+@end