Users authenticated with JWTAuth can not be retrieved from Request

Hi

I am using Laravel Versioned API which uses Dingo. https://github.com/mitchdav/laravel-versioned-api

I am trying to make a middleware to handle ACL.

All examples show that I should get the user from the request inside the middleware, and then I can call ->can on the user to test it's permissions as configured with the gate helper.

The key part of the middleware looks like this:

```
/**
* Handle an incoming request.
*
* @param Request $request
* @param \Closure $next
* @return mixed
*/
public function handle(Request $request, Closure $next)
{
$user = $request->user();
```

However, $user is always null from this call.

I tried several other methods too:

```
/**
* Handle an incoming request.
*
* @param Request $request
* @param \Closure $next
* @return mixed
*/
public function handle(Request $request, Closure $next)
{
$userFromRequest = $request->user();
$userFromAuth = Auth::user();
$id = Auth::id();
$userFromDingoAPI = \Dingo\Api\Facade\API::user();
```

None of it returns thing properly.

My route set up looks like this:

```
$api->version(
'V3',
[
'middleware' => ['api.auth', 'acl'],
'provider' => 'V3'
],
function () use ($api)
{
$api->get('auth/me', 'App\API\V3\Controllers\UserController@me');
}
);
```

I have a work around, but it does not let me use the gate helper functionality.

I can get the user entity with the following code in the middleware:

```
/**
* Handle an incoming request.
*
* @param Request $request
* @param \Closure $next
* @return mixed
*/
public function handle(Request $request, Closure $next)
{
$controller = $request->route()->getController();
$user = $controller->getUser();
```

This calls a method on the controller which calls:

`$user = JWTAuth::parseToken()->authenticate()`

In order to get the user.

This, however, returns the user entity and does not support the gate helper functionality.

Thanks very much in advance.

Will