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/Users/CreateAction.php

@@ -0,0 +1,36 @@
+<?php namespace Flarum\Api\Actions\Users;
+
+use Flarum\Core\Commands\RegisterUserCommand;
+use Flarum\Api\Actions\ApiParams;
+use Flarum\Api\Actions\BaseAction;
+use Flarum\Api\Serializers\UserSerializer;
+
+class CreateAction extends BaseAction
+{
+    /**
+     * Register a user.
+     *
+     * @return Response
+     */
+    protected function run(ApiParams $params)
+    {
+        // We've received a request to register a user. By default, the only
+        // required attributes of a user is the username, email, and password.
+        // Let's set up a command with this information. We also fire an event
+        // to allow plugins to add data to the command.
+        $username = $params->get('users.username');
+        $email    = $params->get('users.email');
+        $password = $params->get('users.password');
+
+        $command = new RegisterUserCommand($username, $email, $password, $this->actor->getUser());
+        $this->dispatch($command, $params);
+
+        // Presumably, the user was created successfully. (The command handler
+        // would have thrown an exception if not.) We set this post as our
+        // document's primary element.
+        $serializer = new UserSerializer;
+        $document = $this->document()->setPrimaryElement($serializer->resource($user));
+
+        return $this->respondWithDocument($document, 201);
+    }
+}