Checking in changes prior to tagging of version 0.50.

Changelog diff is:

diff --git a/Changes b/Changes
index a038f1b..4bde77d 100644
--- a/Changes
+++ b/Changes
@@ -1,5 +1,7 @@
 Revision history for Perl extension CGI::Header.

+0.50 (1.00-RC3) Apr 23rd, 2013
+
   - Tests don't depend on Test::Exception (Thanks to CPAN testers)

 0.49 (RC-1.00) Apr 22nd, 2013
update example