Checking in changes prior to tagging of version 0.04.

Changelog diff is:

diff --git a/Changes b/Changes
index e0a059d..f07432d 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,11 @@ Revision history for Perl extension Ukigumo::Common

 {{$NEXT}}

+0.04 2014-03-13T07:54:10Z
+
+    - Add some constants
+    - Change module building system (inner change)
+
 0.03

     - oops