title: Symfony Vendor Bundle error paramFetcher with FOSRestBundle
body: <p>I'm trying make vendor's bundle which one using FOSRestBundle.</p>
  
  <p>I need to use paramFetcher, but in browser I see:</p>
  
  <pre><code>There is no extension able to load the configuration for "fos_rest" (in xxx/vendor/company/bundle/DependencyInjection/../Resources/config/config.yml). Looked for namespace "fos_rest", found none
  </code></pre>
  
  <p>I made config.yml in this vendor bundle and loading it by
  <code>DependencyInjection/Configuration</code>. What I'm doing wrong?</p>