Checking in changes prior to tagging of version 0.49.

Changelog diff is:

diff --git a/Changes b/Changes
index 10d69bd..ed0ac03 100644
--- a/Changes
+++ b/Changes
@@ -1,5 +1,7 @@
 Revision history for Perl extension CGI::Header.

+0.49 (RC-1.00) Apr 22nd, 2013
+
   - Remove rehash(). new() normalizes property names automatically.

 0.48 (RC-1.00) Apr 20th, 2013