Return all day off recorded for given week and person.
GET
/data/persons/{person_id}/day-offs/week/{year}/{week}
curl \
-X GET http://api.example.com/data/persons/{person_id}/day-offs/week/{year}/{week}
curl \
-X GET http://api.example.com/data/persons/{person_id}/day-offs/week/{year}/{week}