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/Api/Actions/Discussions/UpdateAction.php

@@ -0,0 +1,54 @@
+<?php namespace Flarum\Api\Actions\Discussions;
+
+use Flarum\Core\Commands\EditDiscussionCommand;
+use Flarum\Core\Commands\ReadDiscussionCommand;
+use Flarum\Core\Exceptions\PermissionDeniedException;
+use Flarum\Api\Actions\BaseAction;
+use Flarum\Api\Actions\ApiParams;
+use Flarum\Api\Serializers\DiscussionSerializer;
+
+class UpdateAction extends BaseAction
+{
+    /**
+     * Edit a discussion. Allows renaming the discussion, and updating its read
+     * state with regards to the current user.
+     *
+     * @return Response
+     */
+    protected function run(ApiParams $params)
+    {
+        $discussionId = $params->get('id');
+        $user = $this->actor->getUser();
+
+        // First, we will run the EditDiscussionCommand. This will update the
+        // discussion's direct properties; by default, this is just the title.
+        // As usual, however, we will fire an event to allow plugins to update
+        // additional properties.
+        if ($data = array_except($params->get('discussions'), ['readNumber'])) {
+            $command = new EditDiscussionCommand($discussionId, $user);
+            $this->hydrate($command, $params->get('discussions'));
+            $discussion = $this->dispatch($command, $params);
+        }
+
+        // Next, if a read number was specified in the request, we will run the
+        // ReadDiscussionCommand.
+        //
+        // @todo Currently, if the user doesn't have permission to edit a
+        //     discussion, they're unable to update their readNumber because a
+        //     PermissionsDeniedException is thrown by the
+        //     EditDiscussionCommand above. So this needs to be extracted into
+        //     its own endpoint.
+        if ($readNumber = $params->get('discussions.readNumber')) {
+            $command = new ReadDiscussionCommand($discussionId, $user, $readNumber);
+            $this->dispatch($command, $params);
+        }
+
+        // Presumably, the discussion was updated successfully. (One of the command
+        // handlers would have thrown an exception if not.) We set this
+        // discussion as our document's primary element.
+        $serializer = new DiscussionSerializer(['addedPosts', 'addedPosts.user']);
+        $document = $this->document()->setPrimaryElement($serializer->resource($discussion));
+
+        return $this->respondWithDocument($document);
+    }
+}