Laravel Resource Support

[mpyw]

Resolves #22 (by @trevorgehman)

Use helper traits on Resource and ResourceCollection.

use Illuminate\Http\Resources\Json\JsonResource;
use Lampager\Laravel\LampagerResourceTrait;

class PostResource extends JsonResource
{
    use LampagerResourceTrait;
}

use Illuminate\Http\Resources\Json\ResourceCollection;
use Lampager\Laravel\LampagerResourceCollectionTrait;

class PostResourceCollection extends ResourceCollection
{
    use LampagerResourceCollectionTrait;
}

$posts = App\Post::lampager()
    ->orderByDesc('id')
    ->paginate();

return new PostResourceCollection($posts);

{
  "data": [/* ... */],
  "has_previous": false,
  "previous_cursor": null,
  "has_next": true,
  "next_cursor": {/* ... */}
}

[coveralls]

Coverage remained the same at 100.0% when pulling 9484a4d on laravel-resource-support into 39fe05b on master.

[chitoku-k]

I didn't know this technique... quite nice!

[chitoku-k]

The most of the lines are just properly inherited from the core components. LGTM.