github/markup — pull request #358 by bkeepers (2014-09-11 20:07:20+00:00)
Title: Use case-insensitive regex for file extension matching.

Based on #343, this makes the regular expression for matching file extensions case-insensitive so `.rmd` and `.Rmd` both work.

@gjtorikian @vmg @ymendel see any problem with this?