Checking in changes prior to tagging of version 0.13.

Changelog diff is:

diff --git Changes Changes
index 90ba361..e04eed6 100644
--- Changes
+++ Changes
@@ -2,6 +2,10 @@ Revision history for Perl extension B-Tap

 {{$NEXT}}

+0.13 2014-03-19T11:05:53Z
+
+    - Suppress warnings from Devel::CodeObserver
+
 0.12 2014-03-14T01:42:23Z

     - [Devel::CodeObserver] Load B::Deparse lazily.