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/Middleware/LoginWithHeaderMiddleware.php

@@ -0,0 +1,29 @@
+<?php namespace Flarum\Api\Middleware;
+
+use Flarum\Core\Models\AccessToken;
+use Flarum\Core\Support\Actor;
+use Closure;
+
+class LoginWithHeaderMiddleware
+{
+    protected $actor;
+
+    protected $prefix = 'Token ';
+
+    public function __construct(Actor $actor)
+    {
+        $this->actor = $actor;
+    }
+
+    public function handle($request, Closure $next)
+    {
+        $header = $request->headers->get('authorization');
+        if (starts_with($header, $this->prefix) &&
+            ($token = substr($header, strlen($this->prefix))) &&
+            ($accessToken = AccessToken::where('id', $token)->first())) {
+            $this->actor->setUser($accessToken->user);
+        }
+
+        return $next($request);
+    }
+}