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/RKNSJSONSerialization.m

@@ -0,0 +1,23 @@
+//
+//  RKNSJSONSerialization.m
+//  RestKit
+//
+//  Created by Blake Watters on 8/31/12.
+//  Copyright (c) 2012 RestKit. All rights reserved.
+//
+
+#import "RKNSJSONSerialization.h"
+
+@implementation RKNSJSONSerialization
+
++ (id)objectFromData:(NSData *)data error:(NSError **)error
+{
+    return [NSJSONSerialization JSONObjectWithData:data options:0 error:error];
+}
+
++ (NSData *)dataFromObject:(id)object error:(NSError **)error
+{
+    return [NSJSONSerialization dataWithJSONObject:object options:0 error:error];
+}
+
+@end