title: UploadFormat and annotations
body: <p>Now that the UploadFormat class is available, I have one question about it :</p>
  
  <p>Is the Upload format compatible with Restler annotations ? 
  If yes : how to use it ? "@param file $file" ?</p>
  
  <p>If no : So I don't understand the meaning of this class. How to handle files if we can't receive them in the API methods ?</p>
  
  <p>Thank you anyway for your awesome framework, there are still some work to do to reach perfection but it makes me happy to use a REST api with Swagger-ui</p>