CRM-15251 - Contact details revealed when certain URLs indexed by search engines

Added No Follow and No Index to:
Petition Confirmation pages
Mailing Optouts & Unsubscribe pages
Mailing Subscription Confirmation pages

Conflicts:
	CRM/Mailing/Form/Optout.php
	CRM/Mailing/Form/Unsubscribe.php
CRM-15251 4.4 class variants