backed out 648b42a75739, which was a NON-trivial whitespace commit.  It broke the Typography class's string replacements, for instance
diff --git a/system/core/Hooks.php b/system/core/Hooks.php
index ffb3258..fd6380f 100644
--- a/system/core/Hooks.php
+++ b/system/core/Hooks.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
  *
@@ -67,7 +67,7 @@
 
 		if (defined('ENVIRONMENT') AND is_file(APPPATH.'config/'.ENVIRONMENT.'/hooks.php'))
 		{
-		  include(APPPATH.'config/'.ENVIRONMENT.'/hooks.php');
+		    include(APPPATH.'config/'.ENVIRONMENT.'/hooks.php');
 		}
 		elseif (is_file(APPPATH.'config/hooks.php'))
 		{