Change order of bootstrapping

See commit on flarum/flarum for explanation

src/Support/ExtensionsServiceProvider.php

@@ -0,0 +1,23 @@
+<?php namespace Flarum\Support;
+
+class ExtensionsServiceProvider extends ServiceProvider
+{
+    /**
+     * Register the service provider.
+     *
+     * @return void
+     */
+    public function register()
+    {
+        $config = $this->app->make('Flarum\Core\Settings\SettingsRepository')->get('extensions_enabled');
+        $extensions = json_decode($config, true);
+        $providers = [];
+
+        foreach ($extensions as $extension) {
+            if (file_exists($file = public_path().'/extensions/'.$extension.'/bootstrap.php')) {
+                $providerName = require $file;
+                $providers[$extension] = $this->app->register($providerName);
+            }
+        }
+    }
+}