Add an explicit method to retrieve supported languages.#210

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MischaTheEvil wants to merge 2 commits intorubychan:masterfrom

MischaTheEvil:add_supported_languages_method

Commits on Jun 15, 2017

Add method to explicitly retrieve supported languages.
MischaTheEvil
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Commits on Jun 16, 2017

Make CodeRay.supported_languages tests Ruby 1.8 compatible.
MischaTheEvil
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