Checking in changes prior to tagging of version 0.20.

Changelog diff is:

diff --git a/Changes b/Changes
index 60a7724..13b9c95 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,12 @@ Revision history for Perl extension Monoceros

 {{$NEXT}}

+0.20 2013-08-28T02:40:00Z
+
+  - refactor: remove unused variables
+  - use sockpair instead of a internal unix-domain server
+  - change stats file format
+
 0.19 2013-06-11T17:18:23Z

   - use file stat instead of symlink