Enable ESLint for xplat/yoga/javascript

Summary: We enabled this in GitHub already, and this enables ESLint over the directory in Arcanist so changes made from internal will go through the same validation.

Reviewed By: yungsters

Differential Revision: D42321850

fbshipit-source-id: add4676f55977dbc1817a4e94cd4af6124509697

javascript/just.config.js

@@ -28,7 +28,7 @@ const node = process.execPath;
 
 option("fix");
 
-task("clean", cleanTask({paths: ['build', 'dist']}));
+task("clean", cleanTask({ paths: ["build", "dist"] }));
 
 task(
   "prepare-for-build",