Palestine observes DST starting March 29, 2013.

Thanks to Steffen Thorsen, in
<http://mm.icann.org/pipermail/tz/2013-March/018812.html>.
* asia (Palestine): Add rules for 2011 on, to simplify Gaza and Hebron.
Adjust to recently announced changed.
(Asia/Gaza, Asia/Hebron): Use adjusted rules.