Make Custom Debug Build Configurations Play Nicely With CocoaPods

To test the Word Counter during development, I have long used a special build target. But that doesn't scale well if all I want is change a preprocessor macro to switch from file-based to in memory storage, for example. I've never played around with build configurations in Xcode. They work well with Schemes, though, and setting up a build configuration and a scheme is much less overhead than maintaining a custom target.

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