title: Rackup to use Thin instead of WEBrick
body: <p>New to Sinatra, just development server up and running but <code>rackup</code> is using <code>WEBrick</code> instead of <code>Thin</code>, <code>Thin</code> gem is already installed, this has to be a simple configuration tweak but I don't know where. Oh while you are at it, does <code>Thin</code> auto-refresh when I change the source code? It appears that I have to stop and restart <code>WEBrick</code> when I make source code changes.</p>
  
  <p><strong>EDIT</strong>
  As suggested, <code>thin start</code> works with a tweak for my setup. By itself, it throws an error <code>"start_tcp_server": no acceptor (RuntimeError)</code> which means I already have another service running on that port. To resolve the issue, I simply run <code>thin start -p 9292</code>. Hope this helps someone else.</p>