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/RegisterUserCommandHandler.php

@@ -0,0 +1,33 @@
+<?php namespace Flarum\Core\Handlers\Commands;
+
+use Flarum\Core\Support\DispatchesEvents;
+
+class RegisterUserCommandHandler
+{
+    use DispatchesEvents;
+
+    public function handle($command)
+    {
+        // Assert the the current user has permission to create a user. In the
+        // case of a guest trying to register an account, this will depend on
+        // whether or not registration is open. If the user is an admin, though,
+        // it will be allowed.
+        $command->forum->assertCan($command->user, 'register');
+
+        // Create a new User entity, persist it, and dispatch domain events.
+        // Before persistance, though, fire an event to give plugins an
+        // opportunity to alter the post entity based on data in the command.
+        $user = User::register(
+            $command->username,
+            $command->email,
+            $command->password
+        );
+
+        event(new UserWillBeSaved($user, $command));
+
+        $user->save();
+        $this->dispatchEventsFor($user);
+
+        return $user;
+    }
+}