Fail fast semantics in the FirebaseCredentials API #18
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Throwing IOExceptions from the factory methods in
FirebaseCredentialsclass. These methods used to hold on to the exception, and then throw it at a later time which resulted in confusing error handling semantics. Instead this PR changes the API to throw any encountered exceptions immediately thereby providing much simpler fail fast semantics. This is a breaking change and the PR is drawn against a special io2017 branch.