[Walmart] Split broken MCB coverage

Fixes https://github.com/EFForg/https-everywhere/issues/632
[Wikimedia] Point links.email.donate to links.mkt41.net

Fixes https://github.com/EFForg/https-everywhere/issues/686

Conflicts:
	src/chrome/content/rules/Wikimedia.xml
[Center for Democracy & Technology] Don't force www

(Fixes loop).
Merge remote-tracking branch 'efforg/4.0' into 4.0
[Cloudfront] Add back crossdomain.xml exclusion

Pretty sure the problems are not identical.