CRM-13744 permissions allow 'or' permissions - prevents regression on event registration under some circumstances

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* CRM-13744: cid=0 contribution & event form autocompletes not working for people with *only* access ajax api
  http://issues.civicrm.org/jira/browse/CRM-13744
Merge pull request #2102 from eileenmcnaughton/CRM-13744

CRM-13744 permissions allow 'or' permissions - prevents regression on ev...