CRM-14624 - Removed call by reference in Joomla.php:105

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* CRM-14624: Strict Standards Error - CRM_Utils_System_Joomla
  https://issues.civicrm.org/jira/browse/CRM-14624
Merge pull request #3188 from Ezodesign/CRM-14624

Fixed call by reference in CRM_Utils_System_Joomla