title: Multiple Sinatra apps using rack-mount
body: <p>I have a question regarding using rack-mount with Sinatra. I've got two classic-style Sinatra apps. Let's call one App defined in app.rb and the other API defined in api.rb.</p>
  
  <p>I would like it so that api.rb handles all routes beginning with '/api' and app.rb handles all other requests including the root ('/').</p>
  
  <p>How would I set this up with rack-mount? Or is there a better solution than that?</p>