Checking in changes prior to tagging of version 0.63.

Changelog diff is:

diff --git a/Changes b/Changes
index 06ff3b1..4924b77 100644
--- a/Changes
+++ b/Changes
@@ -1,5 +1,7 @@
 Revision history for Perl extension CGI::Header.

+0.63 (1.00-RC16) Aug 1st, 2013
+
   - Merge CGI::Header::Extended into CGI::Header

 0.62 (1.00-RC15) Jul 31st, 2013