Timezone information: update to 2015f

Timezone information: update to 2015f

Changes in 2015e and 2015f:
http://mm.icann.org/pipermail/tz-announce/2015-June/000032.html
http://mm.icann.org/pipermail/tz-announce/2015-August/000033.html

     Morocco will suspend DST from 2015-06-14 03:00 through 2015-07-19 02:00,
     not 06-13 and 07-18 as we had guessed.

     Assume Cayman Islands will observe DST starting next year, using US rules.
     Although it isn't guaranteed, it is the most likely.

     North Korea switches to +0830 on 2015-08-15.
     The abbreviation remains "KST".

     Uruguay no longer observes DST.

     Moldova starts and ends DST at 00:00 UTC, not at 01:00 UTC.

Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>