Class App\Http\Controllers\AuthController does not exist

Update

The upgrade guide on the Laravel homepage doesn't include the correct namespace for the Authentication routes. I've submitted a pull request to update the docs and I'll amend this message when it is corrected.

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ReflectionException in Container.php line 736: Class App\Http\Controllers\AuthController does not exist

I'm using the latest dev version of 5.1 and when I hit the /auth/login route I get this error. I have followed the Upgrading To 5.1.0 guide as best as I can and as far as I know I have done everything asked of me.

What else should I do? What other information do you need from me in order to help?

I've run:

composer update

composer dump-autoload -o

php artisan clear-cache

AuthController app/Http/Controllers/Auth

<?php namespace App\Http\Controllers\Auth;

use App\User;
use Validator;
use App\Http\Controllers\Controller;
use Illuminate\Foundation\Auth\AuthenticatesAndRegistersUsers;

class AuthController extends Controller
{
    /*
    |--------------------------------------------------------------------------
    | Registration & Login Controller
    |--------------------------------------------------------------------------
    |
    | This controller handles the registration of new users, as well as the
    | authentication of existing users. By default, this controller uses
    | a simple trait to add these behaviors. Why don't you explore it?
    |
    */

    use AuthenticatesAndRegistersUsers;

    protected $redirectTo = '/guestbook';

    /**
     * Create a new authentication controller instance.
     *
     * @return void
     */
    public function __construct()
    {
        $this->middleware('guest', ['except' => 'getLogout']);
    }

    /**
     * Get a validator for an incoming registration request.
     *
     * @param  array  $data
     * @return \Illuminate\Contracts\Validation\Validator
     */
    protected function validator(array $data)
    {
        return Validator::make($data, [
            'name' => 'required|max:255',
            'email' => 'required|email|max:255|unique:users',
            'password' => 'required|confirmed|min:6',
        ]);
    }

    /**
     * Create a new user instance after a valid registration.
     *
     * @param  array  $data
     * @return User
     */
    protected function create(array $data)
    {
        return User::create([
            'name' => $data['name'],
            'email' => $data['email'],
            'password' => bcrypt($data['password']),
        ]);
    }
}

routes.php

// Authentication routes...
get('auth/login', 'AuthController@getLogin');
post('auth/login', 'AuthController@postLogin');
get('auth/logout', 'AuthController@getLogout');

// Registration routes...
get('auth/register', 'AuthController@getRegister');
post('auth/register', 'AuthController@postRegister');