Ported RestKit to using managed object contexts with concurrency types. Numerous cleanups and API updates.

Code/ObjectMapping/RKMapping.m

@@ -0,0 +1,23 @@
+//
+//  RKMapping.m
+//  RestKit
+//
+//  Created by Blake Watters on 2/15/12.
+//  Copyright (c) 2009-2012 RestKit. All rights reserved.
+//
+
+#import "RKMapping.h"
+
+@implementation RKMapping
+
+@synthesize rootKeyPath;
+@synthesize forceCollectionMapping;
+
+- (BOOL)isEqualToMapping:(RKMapping *)otherMapping
+{
+    @throw [NSException exceptionWithName:NSInternalInconsistencyException
+                                   reason:[NSString stringWithFormat:@"You must override %@ in a subclass", NSStringFromSelector(_cmd)]
+                                 userInfo:nil];
+}
+
+@end