Checking in changes prior to tagging of version 0.42.

Changelog diff is:

diff --git a/Changes b/Changes
index 5e47ade..ae3a235 100644
--- a/Changes
+++ b/Changes
@@ -1,5 +1,7 @@
 Revision history for Perl extension CGI::Header.

+0.42  Apr 8th, 2013
+
   - Add handler() attribute which defaults to 'header'.
     If handler() is set to 'redirect', as_string() will invoke: