anchor.diff:      {
         "id": "21",
         "data": {
  -				  "code": "John Doe <john@doe.org>",
  -				  "display_name": "John Doe",
  +				  "code" : "John Doe <john@doe.org>",
   				  "email" : ["john@doe.org", "john.doe@gmail.com"]
   				}
   			}
  
positive.code:   "id":"22"
  }
  
  POST /rest/contributor/22
  > Accept: application/json
  {
    "code": "John Doe <john@doe.org>",
    "display_name": "John Doe",
    "email" : ["john@doe.org", "john.doe@gmail.com"]
  }
  < 200
  < Content-Type: application/json
  {
    "id":"22"
  }
  
  Delete contributor configuration.
  DELETE /rest/contributor/{id}
  < 200
  
  
negative.code:     {
        "id": "21",
        "data": {
  				  "code" : "John Doe <john@doe.org>",
  				  "email" : ["john@doe.org", "john.doe@gmail.com"]
  				}
  			}
  