Checking in changes prior to tagging of version 0.22.

Changelog diff is:

diff --git a/Changes b/Changes
index eb11424..b9876ce 100644
--- a/Changes
+++ b/Changes
@@ -1,5 +1,7 @@
 Revision history for Perl extension CGI::Header.

+0.22  Feb 26th, 2013
+
   This distribution doesn't contain CGI::Header::PSGI anymore,
   which was separated into another distribution, CGI-Header-PSGI.