CRM-12270 fix

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* CRM-12270: Batch Change Participant Status task sends confirmation email and marks contribution completed when participant status is updated FROM "Pending Pay Later" to "Attended" or "Registered"
  http://issues.civicrm.org/jira/browse/CRM-12270
Merge pull request #1286 from monishdeb/CRM-12270

CRM-12270 fix