FIX 500 response for GET requests with body

  Webmachine expects the body of a response to be set on the 
  Request object and a response of {true, Req, Context} in 
  case of POST requests, but expects {Body, Req, Context} 
  in case of GET. These changes ensure the proper response 
  is returned to webmachine.
Merge pull request #5 from spil-dennis/spil

FIX 500 response for GET requests with body