Checking in changes prior to tagging of version 0.30.

Changelog diff is:

diff --git a/Changes b/Changes
index e61240a..a4df625 100644
--- a/Changes
+++ b/Changes
@@ -1,5 +1,7 @@
 Revision history for Perl extension CGI::Header.

+0.30  Mar 4th, 2013
+
   - The following operators are overloaded:

       ""   -> as_string
update POD