title: Github Pull Request Builder - Test this please not trigger build
body: <p>I've configured the Github Pull Request Builder following the instructions in <a href="https://github.com/janinko/ghprb" rel="nofollow">README</a> </p>
  
  <p>It seems work via cron ONLY - it runs the job every hour. However, directly commenting "test this please" or push to repository does not trigger the build. I've a 'bot' jenkins-user as admin in my repository. I've also enabled github-webhook and /jenkins/ghprbhook under <strong>Webhooks &amp; Services</strong></p>
  
  <p>I want to know how the PR Builder react to the "test this please" comment.. is there a way I can monitor it?</p>