Group assets by client in extension stub

stubs/extension/js/forum/Gulpfile.js

@@ -0,0 +1,5 @@
+var gulp = require('flarum-gulp');
+
+gulp({
+  modulePrefix: '{{name}}'
+});

stubs/extension/js/forum/package.json

@@ -0,0 +1,7 @@
+{
+  "private": true,
+  "devDependencies": {
+    "gulp": "^3.8.11",
+    "flarum-gulp": "git+https://github.com/flarum/gulp.git"
+  }
+}

stubs/extension/js/forum/src/main.js

@@ -0,0 +1,4 @@
+import { extend } from 'flarum/extend';
+import app from 'flarum/app';
+
+// TODO