added improved check for controller method access so that CI does not attempt to load private or protected controller methods

added controller/method details to framework initiated 404 pages for logging
diff --git a/system/libraries/Router.php b/system/libraries/Router.php
index f6464a3..d9dd6dd 100644
--- a/system/libraries/Router.php
+++ b/system/libraries/Router.php
@@ -204,7 +204,7 @@
 				// Does the requested controller exist in the sub-folder?

 				if ( ! file_exists(APPPATH.'controllers/'.$this->fetch_directory().$segments[0].EXT))

 				{

-					show_404();	

+					show_404($this->fetch_directory().$segments[0]);	

 				}

 			}

 			else

@@ -225,7 +225,7 @@
 		}

 	

 		// Can't find the requested controller...

-		show_404();	

+		show_404($segments[0]);	

 	}

 		

 	// --------------------------------------------------------------------