Merge pull request #4092 from giant-rabbit/4.3

Fixes for CRM-15247 and CRM-15248 back-ported from 4.4.
CRM-15510 param retrieval issue
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