anchor.diff:              "created_at": "2015-11-29T13:53:39.000Z",
               "updated_at": "2015-11-29T13:53:39.654Z"
           }
  -        
  +
  ++ Response 401 (application/json)        
  +
   + Response 500 (application/json)
   
   
  
positive.code: 
  + Response 403 (application/json)
  
  + Response 409 (application/json)
  
  + Response 500 (application/json)
  
negative.code:             "updated_at": "2015-11-29T13:53:39.654Z"
          }
  
  + Response 401 (application/json)
  
  + Response 500 (application/json)
  
  ### Update certain user by id [PUT]
  Get single user by his id.
  
  