Update timezone data to 2015d

Update timezone data to 2015d

Timezone information is updated to 2015d, released on 24 Apr 2015.

I used build/zoneinfo2lua.pl to pull data from my Ubuntu 15.04.

Changes in 2015d are rather small:
http://mm.icann.org/pipermail/tz-announce/2015-April/000031.html

Changes affecting future time stamps
Egypt will not observe DST in 2015 and will consider canceling it
permanently. For now, assume no DST indefinitely.

Change affecting time zone abbreviations
The abbreviations for Hawaii-Aleutian standard and daylight times
have been changed from HAST/HADT to HST/HDT, as per US Government
Printing Office style. This affects only America/Adak since 1983,
as America/Honolulu was already using the new style.

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