Webpack (#1367)

* Replace gulp with webpack and npm scripts for JS compilation
* Set up Travis CI to commit compiled JS
* Restructure `js` directory; only one instance of npm, forum/admin are "submodules"
* Refactor JS initializers into Application subclasses
* Maintain partial compatibility API (importing from absolute paths) for extensions
* Remove minification responsibility from PHP asset compiler
* Restructure `less` directory

js/src/admin/components/StatusWidget.js

@@ -0,0 +1,41 @@
+/*
+ * This file is part of Flarum.
+ *
+ * (c) Toby Zerner <toby.zerner@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+import DashboardWidget from './DashboardWidget';
+import icon from '../../common/helpers/icon';
+import listItems from '../../common/helpers/listItems';
+import ItemList from '../../common/utils/ItemList';
+
+export default class StatusWidget extends DashboardWidget {
+  className() {
+    return 'StatusWidget';
+  }
+
+  content() {
+    return (
+      <ul>{listItems(this.items().toArray())}</ul>
+    );
+  }
+
+  items() {
+    const items = new ItemList();
+
+    items.add('help', (
+      <a href="http://flarum.org/docs/troubleshooting" target="_blank">
+        {icon('fas fa-question-circle')} {app.translator.trans('core.admin.dashboard.help_link')}
+      </a>
+    ));
+
+    items.add('version-flarum', [<strong>Flarum</strong>, <br/>, app.forum.attribute('version')]);
+    items.add('version-php', [<strong>PHP</strong>, <br/>, app.data.phpVersion]);
+    items.add('version-mysql', [<strong>MySQL</strong>, <br/>, app.data.mysqlVersion]);
+
+    return items;
+  }
+}