title: Multiple heroku accounts
body: <p>I'm having trouble when working with multiple Heroku accounts on my computer.</p>
  
  <p>The thing is that it's worked great before by switching accounts with the heroku gem. But now (even though I've generated new SSH keys) it wont work.</p>
  
  <p>When I do a <code>git push heroku master</code> it just says:</p>
  
  <blockquote>
    <p>my@email.com not authorized to access my_app_name</p>
  </blockquote>
  
  <p>Does anyone have any advice on how I could solve this?</p>