Add Apache license boilerplate to unadorned Core Data files

Code/CoreData/RKConnectionDescription.h

@@ -5,6 +5,18 @@
 //  Created by Blake Watters on 11/20/12.
 //  Copyright (c) 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.
+//
 
 #import <CoreData/CoreData.h>