Dingo Fractal Transformer not working with version 3.2

I'm submitting a ...
[x] bug report
Provide information & explanation I have added entrust package and wanted to create a Role Transformer as per guide by Dingo Api. Insted of getting a json formatted by the transformer, I am getting an array.
code samples

This is my first Dingo Api implementation. This is my

RoleTrasnformer class

namespace App\Api\V1\Transformers;

use League\Fractal\TransformerAbstract;
use App\Role;

class RoleTransformer extends TransformerAbstract
{

    public function transform(Role $role)
    {

        return [
            'role_id' => (int)$role->id,
            'name'    => $role->name
        ];
    }

}

This is RoleController

namespace App\Http\Controllers;

use Dingo\Api\Routing\Helpers;
use Illuminate\Http\Request;
use Dingo\Api\Http\Response;
use App\Role;
use App\Http\Requests;
use App\Api\V1\Transformers\RoleTransformer;

class RoleController extends Controller
{
    use Helpers;

    public function index(){
        $roles = Role::all();

        return $this->response->collection($roles, new RoleTransformer())
                              ->setStatusCode(200);
    }
}

Though I was supposed to get only role_id and name

[

    {
        "id": 1,
        "name": "admin",
        "display_name": "Admin",
        "description": "Administrator",
        "created_at": "2016-07-18 08:11:44",
        "updated_at": "2016-07-18 08:11:44"
    },
    {
        "id": 2,
        "name": "director",
        "display_name": "Director",
        "description": "Country Manager",
        "created_at": "2016-07-18 08:11:44",
        "updated_at": "2016-07-18 08:11:44"
    },
    {
        "id": 3,
        "name": "manager",
        "display_name": "Manager",
        "description": "Team Manager",
        "created_at": "2016-07-18 08:11:44",
        "updated_at": "2016-07-18 08:11:44"
    }

]

Not sure what I am doing wrong. Please help me to identify the glitch.

I've searched over the stackoverflow and other forums and it seems Dingo has issue with Laravel 5.2 but didn't get anything solid or how to solve it.

Laravel & Angular version: 3.2.0

jadjoubran / laravel5-angular-material-starter

Dingo Fractal Transformer not working with version 3.2 #369