title: codeception phpbrowser with different URL on dev/staging/live
body: <p>I'm new to Codeception, and trying to reproduce my previous PHPUnit setup.</p>
  
  <p>I have two servers on which I test. They have different URLs for the PphBrowser configuration and I can't figure out how to teach it this.</p>
  
  <p>On my local dev machine, the correct config is:</p>
  
  <pre><code>        url: 'http://localhost:8080/app_dev.php/'
  </code></pre>
  
  <p>but on the staging and live machine, it must be:</p>
  
  <pre><code>        url: 'http://localhost/'
  </code></pre>
  
  <p>I've not found anything in the documentation that works similar to symfony2's config_dev.yml / config_test.yml files. Anyone got a solution?</p>