add session_id to signup_form
use SHA1 to hash session_id
when signup error occurs, display error messages within signup_form
Checking in changes prior to tagging of version 0.06.

Changelog diff is:

diff --git a/Changes b/Changes
index d382924..2589bef 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,11 @@ Revision history for Perl extension XiuMai

 {{$NEXT}}

+0.06 2014-11-03T13:48:10Z
+
+    - enable siging up
+    - add auto initialization of XIUMAI_HOME and XIUMAI_DATA
+
 0.05 2014-11-01T04:13:54Z

     - add user authentication