Sync zoneinfo database with tzdata2015e from ftp://ftp.iana.org/tz/releases

Sync zoneinfo database with tzdata2015e from ftp://ftp.iana.org/tz/releases

* africa: Morocco suspends DST from 2015-06-14 03:00 through
    2015-07-19 02:00, not 06-13 and 07-18 as we had guessed.
    (Thanks to Milamber.)

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

* southamerica: Typo fix.