Snaps only nofollow external links
Merge branch 'master' into noFollowAllSnaps

Conflicts:
	common/app/common/LinkTo.scala
Merge branch 'master' into noFollowAllSnaps

Conflicts:
	common/app/views/fragments/items/facia_cards/list.scala.html
	common/app/views/fragments/items/facia_cards/show_more.scala.html
Merge pull request #6075 from guardian/noFollowAllSnaps

No follow all snaps