More powerful/extensible notifications

- Notifications can be delivered in multiple ways (alert, email)
- Different notification types can implement interfaces to allow
themselves to be delivered in these various ways
- User preferences for each notification type/method combination are
automatically registered

src/Core/Notifications/NotificationServiceProvider.php

@@ -0,0 +1,35 @@
+<?php namespace Flarum\Core\Notifications;
+
+use Illuminate\Contracts\Events\Dispatcher;
+use Illuminate\Support\ServiceProvider;
+use Flarum\Core\Models\User;
+
+class NotificationServiceProvider extends ServiceProvider
+{
+    /**
+     * Bootstrap the application events.
+     *
+     * @return void
+     */
+    public function boot(Dispatcher $events)
+    {
+        $notifier = app('Flarum\Core\Notifications\Notifier');
+
+        $notifier->registerMethod('alert', 'Flarum\Core\Notifications\Senders\NotificationAlerter');
+        $notifier->registerMethod('email', 'Flarum\Core\Notifications\Senders\NotificationEmailer');
+
+        $notifier->registerType('Flarum\Core\Notifications\Types\DiscussionRenamedNotification', ['alert' => true]);
+
+        $events->subscribe('Flarum\Core\Handlers\Events\DiscussionRenamedNotifier');
+    }
+
+    public function register()
+    {
+        $this->app->bind(
+            'Flarum\Core\Repositories\NotificationRepositoryInterface',
+            'Flarum\Core\Repositories\EloquentNotificationRepository'
+        );
+
+        $this->app->singleton('Flarum\Core\Notifications\Notifier');
+    }
+}