/**
  * __construct
  *
  * constructor for ZimbraAdmin API
  *
  * @since		version 1.0
  * @access	public
  * @param	string $username username to use in the construction of object
  * @param	string $which type to construct, defaults to prod
  */
 public function __construct($username = '******', $which = 'prod')
 {
     $file = "other/zimbra" . ($which == 'prod' ? '' : '_dev');
     $credentials = PSUDatabase::connect($file, 'return');
     $this->_admin_username = $credentials['username'];
     $this->_admin_password = $credentials['password'];
     parent::__construct($username, $which);
     $this->_protocol = 'https://';
 }