CRM-15418 - Prevent non-contact tokens from being lost in replaceGreetingTokens function.

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* CRM-15418:
  https://issues.civicrm.org/jira/browse/CRM-15418
Merge pull request #4409 from davecivicrm/CRM-15418

CRM-15418 - Prevent non-contact tokens from being lost in replaceGreetin...