CRM-12920 - search exposes bulk actions user has no permission to accesss

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* CRM-12920: Edit all contacts permission overrides CiviEvent/CiviContrib permissions in search
  https://issues.civicrm.org/jira/browse/CRM-12920
Merge pull request #4291 from mrpaulc/CRM-12920

CRM-12920 - search exposes bulk actions user has no permission to access...