title: unexpected result following a tutorial (omniauth twitter) No route matches [GET] "/auth/twitter"
body: <p>I followed this guide step by step: <a href="http://railscasts.com/episodes/241-simple-omniauth" rel="nofollow">http://railscasts.com/episodes/241-simple-omniauth</a></p>
  
  <p>When I click the button that would take me on twitter, the result is this: </p>
  
  <blockquote>
    <p>No route matches [GET] "/auth/twitter"</p>
  </blockquote>
  
  <p>I made ​​several attempts, watching the video in slow motion ... but the result is always the same</p>