Fixed bug in Date::Manip::Date::list_holidays.
It was using 'now' instead of the stored date. Douglas DeStafenoReordered TZ detection methods
Moved checking the tzdata files to lower priority to avoid a pretty
unusual situation in docker. Sven Nierlein (GitHub #20)Time zone fixes
Newest zoneinfo data (tzdata 2018i). Requested by Shawn C Carroll
(GitHub #28)