Fixed problem with Cocoapods spec

I was getting errors in showAlertWithAppStore version because there Harpy Bundle could not be located. Perhaps it is a problem with the newest Cocoapods version?

Steps to reproduce:
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1. Install `cocoapods` 0.19.1
2. Include Harpy 2.3.3 in a project
3. Call one of the `check` methods
4. You should get a nil exception having to do with `NSPlaceholderString` in `showAlertWithAppStoreVersion`. 

Commit message
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Changed spec to include entire bundle due to problems finding the Harpy Bundle and errors thrown in `-[showAlertWithAppStoreVersion:(NSString *)currentAppStoreVersion]`.