remove tests of coffeescript etc

Author: Rich-Harris

package.json

@@ -47,7 +47,6 @@
     "acorn": "^5.1.1",
     "chalk": "^2.0.1",
     "codecov": "^2.2.0",
-    "coffeescript": "^2.0.2",
     "console-group": "^0.3.2",
     "css-tree": "1.0.0-alpha22",
     "eslint": "^4.3.0",
@@ -56,16 +55,13 @@
     "estree-walker": "^0.5.1",
     "glob": "^7.1.1",
     "jsdom": "^11.1.0",
-    "less": "^2.7.3",
     "locate-character": "^2.0.0",
     "magic-string": "^0.22.3",
     "mocha": "^3.2.0",
     "nightmare": "^2.10.0",
     "node-resolve": "^1.3.3",
-    "node-sass": "^4.7.1",
     "nyc": "^11.1.0",
     "prettier": "^1.7.0",
-    "pug": "^2.0.0-rc.4",
     "reify": "^0.12.3",
     "rollup": "^0.48.2",
     "rollup-plugin-buble": "^0.15.0",