CRM-13967 allow additional of anonymous tokens for logged out users when viewing mailing

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* CRM-13967: Public Mailing View page doesn't render hook tokens
  http://issues.civicrm.org/jira/browse/CRM-13967
Merge pull request #2470 from eileenmcnaughton/CRM-13967

CRM-13967 allow additional of anonymous tokens for logged out users when...