title: Register custom gateway with PayumBundle
body: <p>I am trying to register a custom Gateway Factory with the PayumBundle. If I register my Gateway Factory directly with the PayumBuilder it works fine. But if i add it via the PayumBundle all the extensions are missing.</p>
  
  <pre><code># app/config/config.yml
  payum:
      gateways_v2:
          superpay:
              factory: superpay
              service: ~
  </code></pre>
  
  <p>And my service configuration looks like this:</p>
  
  <pre><code># app/config/services.yml
  services:
      app.superpay.factory:
          class: App\Payum\Superpay\SuperpayGatewayFactory
          arguments:
              - { url: http://www.example.com } # change this
          tags:
              - { name: payum.gateway_factory, factory_name: superpay, human_name: Superpay }
  </code></pre>
  
  <p>Maybe it's related to <a href="https://github.com/Payum/Payum/issues/452" rel="nofollow">https://github.com/Payum/Payum/issues/452</a></p>
  
  <p>I use symfony 2.8, payum-core 1.2.2 and payum-bundle 1.2.3</p>
  
  <hr>
  
  <p><strong>Update:</strong> With payum-bundle 2.0 it works with this configuration</p>
  
  <pre><code># app/config/config.yml
  payum:
      gateways:
          superpay:
              factory: superpay
              url: http://www.example.com
  </code></pre>
  
  <p>and service configuration like</p>
  
  <pre><code># app/config/services.yml
  
  services:
      app.superpay.factory
          class: Payum\Core\Bridge\Symfony\Builder\GatewayFactoryBuilder
          arguments: [App\Payum\Superpay\SuperpayGatewayFactory]
          tags:
              - { name: payum.gateway_factory_builder, factory: girosim }
  </code></pre>