Checking in changes prior to tagging of version 0.05.

Changelog diff is:

diff --git Changes Changes
index 539fed1..8caee1d 100644
--- Changes
+++ Changes
@@ -2,6 +2,11 @@ Revision history for Perl extension PLON

 {{$NEXT}}

+0.05 2014-04-03T15:22:40Z
+
+    - PSON renamed PLON. Because there is PHP library named PSON.
+    - Added CodeRef serialization feature.
+
 0.04 2014-04-02T12:03:09Z

     - Added 'decode_pson' method.