Upgrade to L5 + huge refactor + more. closes #2

New stuff:
- Signup + email confirmation.
- Updated authentication strategy with remember cookies. closes #5
- New search system with some example gambits! This is cool - check out
the source. Fulltext drivers will be implemented as decorators
overriding the EloquentPostRepository’s findByContent method.
- Lay down the foundation for bootstrapping the Ember app.
- Update Web layer’s asset manager to properly publish CSS/JS files.
- Console commands to run installation migrations and seeds.

Refactoring:
- New structure: move models, repositories, commands, and events into
their own namespaces, rather than grouping by entity.
- All events are classes.
- Use L5 middleware and command bus implementations.
- Clearer use of repositories and the Active Record pattern.
Repositories are used only for retrieval of ActiveRecord objects, and
then save/delete operations are called directly on those ActiveRecords.
This way, we don’t over-abstract at the cost of Eloquent magic, but
testing is still easy.
- Refactor of Web layer so that it uses the Actions routing
architecture.
- “Actor” concept instead of depending on Laravel’s Auth.
- General cleanup!

src/Core/Handlers/Commands/StartDiscussionCommandHandler.php

@@ -0,0 +1,53 @@
+<?php namespace Flarum\Core\Handlers\Commands;
+
+use Illuminate\Contracts\Bus\Dispatcher;
+use Flarum\Core\Models\Discussion;
+use Flarum\Core\Events\DiscussionWillBeSaved;
+use Flarum\Core\Commands\PostReplyCommand;
+use Flarum\Core\Support\DispatchesEvents;
+
+class StartDiscussionCommandHandler
+{
+    use DispatchesEvents;
+
+    protected $bus;
+
+    public function __construct(Dispatcher $bus)
+    {
+        $this->bus = $bus;
+    }
+
+    public function handle($command)
+    {
+        $command->forum->assertCan($command->user, 'startDiscussion');
+
+        // Create a new Discussion entity, persist it, and dispatch domain
+        // events. Before persistance, though, fire an event to give plugins
+        // an opportunity to alter the discussion entity based on data in the
+        // command they may have passed through in the controller.
+        $discussion = Discussion::start(
+            $command->title,
+            $command->user
+        );
+
+        event(new DiscussionWillBeSaved($discussion, $command));
+
+        $discussion->save();
+
+        // Now that the discussion has been created, we can add the first post.
+        // For now we will do this by running the PostReply command, but as this
+        // will trigger a domain event that is slightly semantically incorrect
+        // in this situation (PostWasPosted), we may need to reconsider someday.
+        $post = $this->bus->dispatch(
+            new PostReplyCommand($discussion->id, $command->content, $command->user)
+        );
+
+        // The discussion may have been updated by the PostReplyCommand; we need
+        // to refresh its data.
+        $discussion = $post->discussion;
+
+        $this->dispatchEventsFor($discussion);
+
+        return $discussion;
+    }
+}