Checking in changes prior to tagging of version 0.27.

Changelog diff is:

diff --git a/Changes b/Changes
index 50e370c..2ea00bf 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,12 @@ Revision history for Perl module Ukigumo::Client

 {{$NEXT}}

+0.27 2014-04-03T08:21:51Z
+
+    - Measure the elapsed time (moznion)
+    - Normalize paths for work directory (mattn)
+    - Fix the problem that does not work certainly on Windows (mattn)
+
 0.26 2014-03-27T23:25:33Z

     - Support report_timeout() method