introduce RKManagedObjectCache protocol to CoreData component; cleanup remaining NSFetchRequest ivars that are now unused; add RKURL class for making resourcepath and baseurl params available to higher level components; cleanup Three20 library to incorporate latest updates from GateGuru codebase

Code/CoreData/RKManagedObjectCache.h

@@ -0,0 +1,22 @@
+/*
+ *  RKManagedObjectCache.h
+ *  RestKit
+ *
+ *  Created by Jeff Arena on 10/15/10.
+ *  Copyright 2010 GateGuru. All rights reserved.
+ *
+ */
+
+/**
+ * Class used for determining the set of NSFetchRequest objects that
+ * map to a given request URL.
+ */
+@protocol RKManagedObjectCache
+
+/**
+ * Must return an array containing NSFetchRequests for use in retrieving locally
+ * cached objects associated with a given request resourcePath.
+ */
+- (NSArray*)fetchRequestsForResourcePath:(NSString*)resourcePath;
+
+@end