Checking in changes prior to tagging of version 0.15.

Changelog diff is:

diff --git a/Changes b/Changes
index 88a8080..36d1678 100644
--- a/Changes
+++ b/Changes
@@ -1,5 +1,8 @@
 Revision history for Perl extension Kossy

+0.15    Fri Apr 0:29:46 2013
+        - render_json: enable allow_blessed and convert_blessed
+
 0.14    Thu Mar 14 22:25:49 2013
         - Kossy::Validator: support Coderef default