redirect wikimania.org/.com to wikimania2015

The Wikimedia Switzerland  chapter used to
control the domains wikimania.org and .com

The board of WMCH recently decided to give
them to WMF. So we are about to switch
them over and added DNS zones in Ie5449f5ad671cf
and Ie5449f5ad671cf.

The status quo is a redirect from
wikimania.org/.com to wikimania2014.wikimedia.org

So we need to add it in our Apache config as well.

While touching it we are also switching it over
from 2014 to 2015. So now we are redirecting
both domains and also wikimania.wikimedia.org to
wikimania2015.wikimedia.org for the upcoming
Mexico Wikimania.

RT: 5587

Change-Id: I191b46a2eb5685e01a782b22a703c9792d2a15c5
RT: 5587