Makes it possible to detect the language of a snippet of code
without having an actual file on disk
Will allow github-markup to use Linguist without restricting its API
This gives us a consistent test framework across all Ruby versions which
should help avoid errors that are only found when CI runs the tests on
different Rubies. (And this fixes an immediate bug where there's no
`skip` method in the version of test-unit we're currently using only on
Ruby 2.2.)
