CRM-12060 - Support hook_civicrm_permissions on WordPress

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* CRM-12060: Support hook_civicrm_permissions on WordPress
  http://issues.civicrm.org/jira/browse/CRM-12060
Merge pull request #1769 from vivekarora/CRM-12060-4.4Patch

CRM-12060 - Support hook_civicrm_permissions on WordPress