backed out 648b42a75739, which was a NON-trivial whitespace commit.  It broke the Typography class's string replacements, for instance
diff --git a/system/helpers/directory_helper.php b/system/helpers/directory_helper.php
index 7579014..38347fa 100644
--- a/system/helpers/directory_helper.php
+++ b/system/helpers/directory_helper.php
@@ -1,4 +1,4 @@
-<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
+<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
 /**
  * CodeIgniter
  *
@@ -31,7 +31,7 @@
  * Create a Directory Map
  *
  * Reads the specified directory and builds an array
- * representation of it. Sub-folders contained with the
+ * representation of it.  Sub-folders contained with the
  * directory will be mapped as well.
  *
  * @access	public