CRM-14501 - Fix CRM_Contact_BAO_Relationship::getPermissionedContacts so it can handle a list of one or more relationshipTypeIDs.

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* CRM-14501:
  http://issues.civicrm.org/jira/browse/CRM-14501
Merge pull request #2297 from davecivicrm/CRM-14051

CRM-14501 - Fix CRM_Contact_BAO_Relationship::getPermissionedContacts so...