+Fix this error:
+
+ PHP Fatal error: Call-time pass-by-reference has been removed in /usr/share/php/Spreadsheet/Excel/Writer/Worksheet.php on line 2490
+
+diff -Naur orig/Spreadsheet/Excel/Writer/Worksheet.php new/Spreadsheet/Excel/Writer/Worksheet.php
+--- orig/Spreadsheet/Excel/Writer/Worksheet.php 2014-01-06 11:42:54.901378977 -0500
++++ new/Spreadsheet/Excel/Writer/Worksheet.php 2014-01-06 11:45:03.717374367 -0500
+@@ -2486,8 +2486,7 @@
+ $data = pack('v', count($ranges));
+ foreach($ranges as $range)
+ $data .= pack('vvvv', $range[0], $range[2], $range[1], $range[3]);
+- $string=$header.$data;
+- $this->_append(&$string, true);
++ $this->_append($header.$data, true);
+ }
+ }
+