Added filtering feature
Checking in changes prior to tagging of version 0.31.

Changelog diff is:

diff --git Changes Changes
index 445f63d..bf7c86f 100644
--- Changes
+++ Changes
@@ -2,6 +2,10 @@ Revision history for Perl extension Test-Kantan

 {{$NEXT}}

+0.31 2014-03-26T06:23:11Z
+
+    - filtering test cases
+
 0.30 2014-03-25T00:27:23Z

     - Given/When/Then No longer takes the code.