:memo: It's Sass, not SASS.

Well, after disappointedly learning that Atom uses LESS internally, I figure, it can at least properly capitalize our dearest language, Sass.

Also, probably needs more refactor as "SCSS" isn't really a language and is just standard "Sass", but the indented syntax (with the .sass extension) is typically referred to as "Sass (indented)". But, that's for another commit.