CRM-13261 new apiwrapper hook
Merge branch 'crm-13261-api-hook' of git://github.com/tttp/civicrm-core into pull-request-1491
CRM-13261 - Add unit test for hook_civicrm_apiWrappers

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* CRM-13261: add hooks to extend the API from extension
  http://issues.civicrm.org/jira/browse/CRM-13261
CRM-13261 - Fix spelling inconsistency ("apiWrapper" vs "apiWrappers")

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* CRM-13261: add hooks to extend the API from extension
  http://issues.civicrm.org/jira/browse/CRM-13261
CRM_Utils_API_ReloadOptionTest - Fix typo