Pull Request #132 Correctly lint R as supported language

While this is officially a community-supported language, we shouldn't
warn when it is specified.

Also, add test coverage for un-aliased languages (though it's definitely possible I've simply
failed to find their current tests).

This should resolve the following issue: https://github.com/travis-ci/travis-yaml/issues/90

QuantumDecay avatar QuantumDecay

Pull request event #191.1 passed

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