CRM-13853 - updatePledgeStatus should be declared static in CRM_Pledge_BAO_Pledge

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* CRM-13853: updatePledgeStatus should be declared static in CRM_Pledge_BAO_Pledge
  http://issues.civicrm.org/jira/browse/CRM-13853
Merge pull request #2113 from freeform/CRM-13853

CRM-13853 - updatePledgeStatus should be declared static in CRM_Pledge_B...