Fix a typo in Common.php
diff --git a/system/core/Common.php b/system/core/Common.php
index 7e93ed4..06b1622 100644
--- a/system/core/Common.php
+++ b/system/core/Common.php
@@ -172,7 +172,7 @@
 		if ($name === FALSE)
 		{
 			// Note: We use exit() rather then show_error() in order to avoid a
-			// self-referencing loop with the Excptions class
+			// self-referencing loop with the Exceptions class
 			set_status_header(503);
 			exit('Unable to locate the specified class: '.$class.'.php');
 		}