Fix to Core Data Tutorial

The default name for the app delegate in a Core Data template changed in Xcode 2.2 from "XXXAppDelegate" to "XXX_AppDelegate". This effectively broke the Core Data tutorial at Cocoa Dev Central. There are now two versions available for download:

Download either the version of the NIB for Xcode 2.2 or later, or download the NIB for Xcode 2.0/2.1. Download only one version. Once you have the file, double-click it to decompress it.

Okay, so it's fixed now. Everyone can stop emailing me about it. :)

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