Revert "HTTP::Session2 use the secret token as 'data'. it uses session ID as a 'key'."

This reverts commit 07ccd4ad166cdd42007c3c800ca265d68155d726.
Checking in changes prior to tagging of version 1.01.

Changelog diff is:

diff --git Changes Changes
index e4f103f..a54cf21 100644
--- Changes
+++ Changes
@@ -2,6 +2,11 @@ Revision history for Perl extension HTTP-Session2

 {{$NEXT}}

+1.01 2014-07-28T11:43:10Z
+
+    - Revert HMAC strategy...
+      It breaks our code...
+
 1.00 2014-07-28T04:09:47Z

     [INCOMPATIBLE CHANGE]