Updated ignore.
Pass the NSError object to the listener to help with fault diagnosis.
Pass the NSError object to the listener to help with fault diagnosis. Provide a meaningful error when the 'failed' callbacks are invoked for an unauthenticated player.
Makes the domain constant public to allow clients to verify it against the NSError domain.
Merge pull request #75 from outofcoffee/feature/improved-errors

Pass the NSError object to the listener to help with fault diagnosis on Game Center failures.