title: Foreman does not kill processes
body: <p>For start application i use Foreman.
  Foreman start process from Procfile</p>
  
  <pre><code>web: bundle exec rails server thin -p $PORT
  worker: bundle exec rake environment resque:work QUEUE=send_mail
  api: bundle exec rails server thin -p $PORT
  </code></pre>
  
  <p>If i press control+C in console where i run foreman, foreman is ended but ran process is not killed. Is it possible to kill process that foreman ran when foreman killed.</p>