title: how to make a sinatra app run in rails 4?
body: <p>I have a Sinatra app and I'd like to start building new functionality in Rails while still supporting the existing Sinatra functionality.  I've tried the following strategies: </p>
  
  <ol>
  <li>sinatra's rackup routes some requests to rails and some to sinatra</li>
  <li>sinatra's rackup includes rails</li>
  <li>rails' rackup includes sinatra.</li>
  </ol>
  
  <p>Many of my searches resulted in rails 3, not 4.  Additionally, does Rails <em>have</em> to generate the db versus using one that Sinatra was using (in this case, the Sequel gem to access Sqlite3.)  In general the errors I was getting were about gems and paths.  (Although I did rebundle and try different versions of paths.)</p>
  
  <p>Any suggestions on the best way to use Rails 4 while still supporting an existing Sinatra app? </p>