added API annotations, CRM-14330

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* CRM-14330: Add REST-related annotations to generated entities
  http://issues.civicrm.org/jira/browse/CRM-14330
removed unwanted annotations, CRM-14330

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* CRM-14330: Add REST-related annotations to generated entities
  http://issues.civicrm.org/jira/browse/CRM-14330