title: Split Grape API (non-Rails) into different files
body: <p>I am writing an API in Grape, but it stands alone, with no Rails or Sinatra or anything. I'd like to split the <code>app.rb</code> file into separate files. I have looked at <a href="https://stackoverflow.com/questions/14857987/how-to-split-things-up-in-a-grape-api-app">How to split things up in a grape api app?</a>, but that is with Rails.</p>
  
  <p>I'm not sure how to make this work with modules or classes — I did try subclassing the different files into my big <code>GrapeApp</code>, but that was ugly and I'm not even sure it worked properly. What's the best way to do this?</p>
  
  <p>I currently have versions split by folders (<code>v1</code>, <code>v2</code>, etc) but that is all.</p>