Update to 2016d

See http://www.iana.org/time-zones

Split of ZoneProvider

Starting with Time4J-v3.20 or v4.16, users are asked to at least use this version.

Update to 2016c

See http://www.iana.org/time-zones

Update to 2016b

Taken from github/eggert/tz-releases.

Safe loading of tz-repository

See MenoData/Time4J#464

NPE-fix

Use v1.9-2016a instead which is more robust.

Update to 2016a

See http://mm.icann.org/pipermail/tz-announce/2016-January/000035.html

Update to 2015g

See http://mm.icann.org/pipermail/tz-announce/2015-October/000034.html

Update to 2015f

Requires at least the version v3.5/4.3 or higher in Time4J.

Adaptation to new serialization format

Based on tz-tool-v1.5.