Fix detection for invalid shebang
SCSS isnt SASS
Merge pull request #1818 from github/remove-scss-from-sass

SCSS isnt SASS
Merge pull request #1813 from github/invalid-shebang

Fix detection for invalid shebang
v4.2.2
Clean before running janky build
Add Forth extension .fr; and a sample.
Add 'text' language and heuristics for .fr.
Add .html.fr and .xml.fr; plus samples for .txt.