anchor.diff:  
   Update a submission with new fields values. Returns the updated submission in a JSON array
   If finalize is set to true finalize the submission and get back the submission receipt number.
  -PUT /submission/<submission_id>
  +PUT /submission/{submission_id}
   {"context_gus":"d1c364a2-65ed-4794-9664-7edb9858e0e6","wb_fields":{"Full description":"22","Short title":"11"},"finalize":true,"files":["00186c18-5909-4cd3-ba48-041dc16a4741"],"receivers":["63793685-b9a0-4ead-812d-4af62800017c"]}
   < 200
   < Content-Type: application/json
  
positive.code: }
  
  Upload a file to the selected submission_id. Returns a JSON array with file information and the file id to integrate in the submission.
  POST /submission/<submission_id>/file
  > Content-Disposition: attachment; filename="1375208531.png"
  > Content-Length: 27130
  > Content-Type: image/png
  
negative.code: }
  
  Returns the currently submitted fields and material filenames and size, this is the only interface giving back the complete submission status
  GET /submission/{submission_id}
  < 200
  < Content-Type: application/json
  {
  