Custom validator in Laravel 5 fails - php

Question

I'm trying to use a custom validator of laravel 5, I intend to validate two fields so that one is greater than the other. Follow the steps in this link http://goo.gl/3236xn but could not make the application call the validation method. Can anyone give any tips?
Step 1: Make a bind class where you can implement each rule you want extending Validator class, as follow:
<?php
namespace App\Services;
use \Illuminate\Validation\Validator;
class GreaterThanValidator extends Validator
{
public function validateGreaterThan($attribute, $value, $parameters)
{
if (isset($parameters[1])) {
$other = $parameters[1];
return (floatval($value) > floatval($other)) ;
} else {
return true;
}
}
}
Step 2:Make a service provider that extends ServiceProvider, as follow:
<?php
namespace App\Providers;
use Illuminate\Validation\Validator;
use Illuminate\Support\ServiceProvider;
use App\Services\GreaterThanValidator;
class ValidatorsServiceProvider extends ServiceProvider
{
public function boot()
{
Log::info('passando pelo provider...');
\Validator::resolver(function($translator, $data, $rules, $messages) {
Log::info('chamando new...');
return new \App\Services\GreaterThanValidator($translator, $data, $rules, $messages);
});
}
public function register()
{
}
}
Step 3:Add your custom validator provider at config/app.php file.
/*
* Application Service Providers...
*/
'App\Providers\AppServiceProvider',
'App\Providers\BusServiceProvider',
'App\Providers\ConfigServiceProvider',
'App\Providers\EventServiceProvider',
'App\Providers\RouteServiceProvider',
'App\Providers\ValidatorsServiceProvider',
I forgot to specify, but the controller have the following rule
$rules = array(
'vlFixado' => 'greater_than:vl_anulacao,' . $vlAnulacao,
);
To validate:
$validator = Validator::make(Input::all(), $rules, $messages);