Refactor the code around done_testing.
Checking in changes prior to tagging of version 0.26.

Changelog diff is:

diff --git a/Changes b/Changes
index b18e6b4..977c221 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,10 @@ Revision history for Perl extension Test-Kantan

 {{$NEXT}}

+0.26 2014-03-12T20:45:40Z
+
+    - remove TEST_ prefix from the environment variables.
+
 0.25 2014-03-12T10:28:50Z

     - Added stub for Test::Builder.