Remove expired certificates and add a note about how to generate new ones.  Add some coding declarations where necessary.
diff --git a/examples/certgen.py b/examples/certgen.py
index e37d0c7..ac6b8bf 100644
--- a/examples/certgen.py
+++ b/examples/certgen.py
@@ -1,4 +1,4 @@
-#
+# -*- coding: latin-1 -*-
 # certgen.py
 #
 # Copyright (C) Martin Sjögren and AB Strakt 2001, All rights reserved