Successfully unavailable

Fixed

• uninitialized constant API::Controllers::InternalError for ubuntu 16.04

Added

• Kigo min_stay validity check, returning an error Result if the promised MIN_STAY_RULES is not found
• Rentals United: add arrival instructions to Roomorama::Property

Changed

• Unavailable quotations are of status code 200
• Rentals United: support caching for needed fetcher classes