github/linguist — pull request #831 by ethanwhite (2013-12-12 18:46:23+00:00)
Title: Added RMarkdown to the list of languages

RMarkdown is a markup language that allows combining Markdown with chunks of executable R code. It is increasingly used for literate programming and generating reproducible reports and papers in R.

Additional Details:
http://www.rstudio.com/ide/docs/r_markdown