Allow GitHub embeds to specify optional language
@@ -181,7 +181,7 @@ mixin codepen(slug, height, default_tab)
alt_file - [string] alternative file path used in footer and link button
height - [integer] height of code preview in px
-mixin github(repo, file, alt_file, height)
+mixin github(repo, file, alt_file, height, language)
- var branch = ALPHA ? "develop" : "master"
- var height = height || 250
