Remove files sections in JS libs package.json.

Those exclude unlisted files (d.ts files mostly) that we want bundled in.
No point in listing d.ts files since we already keep those folders clean.

css/package.json

@@ -3,10 +3,6 @@
   "version": "2.2.1",
   "description": "CSS parser / stringifier",
   "main": "index",
-  "files": [
-    "index.js",
-    "lib"
-  ],
   "dependencies": {
     "source-map": "^0.1.38",
     "source-map-resolve": "^0.3.0",