title: File upload with Sinatra
body: <p>I am trying to be able to upload files with Sinatra. I have the code <a href="http://github.com/eturk/marvin" rel="noreferrer">here</a>, but I'm getting the error "method file_hash does not exist" (see /lib/mvc/helpers/helpers.rb).</p>
  
  <p>What is going on here? Is there some dependency I'm missing.</p>