Added BOM to CSV export files

Export/Exporter.php

@@ -46,7 +46,7 @@ class Exporter
                 $contentType = 'application/json';
                 break;
             case 'csv':
-                $writer      = new CsvWriter('php://output', ',', '"', "", true);
+                $writer      = new CsvWriter('php://output', ',', '"', "", true, true);
                 $contentType = 'text/csv';
                 break;
             default: