title: Procfile start processes in their own working directory
body: <p>I have this simple Procfile</p>
  
  <pre><code>web: myapp
  </code></pre>
  
  <p>myapp is in the path, but the processes home directory should be ./directory/. How can I specify in the Procfile where the process is to be started?</p>
  
  <p><a href="https://github.com/ddollar/foreman/pull/101" rel="noreferrer">https://github.com/ddollar/foreman/pull/101</a> doesn't help because it assumes, that this working directory should be the same for every process specified by the Procfile</p>