Merge pull request chriskacerguis#228 from justinethier/master

When outputting CSV escape double quotes per RFC 4180

Author: Phil Sturgeon

application/libraries/Format.php

@@ -200,6 +200,7 @@ public function to_csv()
 		$output = implode(',', $headings).PHP_EOL;
 		foreach ($data as &$row)
 		{
+			$row = str_replace('"', '""', $row); // Escape dbl quotes per RFC 4180
 			$output .= '"'.implode('","', $row).'"'.PHP_EOL;
 		}