jonschlinkert/sublime-markdown-extended — pull request #28 by bachue (2013-10-17 12:58:53+00:00)
Title: Fix the bug that it regard ruby syntax as r syntax after pull/26

I can't understand why it regards all languages whose name starts with r
as r language, and I don't know how many other languages was influenced
by it. But I must save Ruby!

Just move the Ruby part to the front. It can work.