Checking in changes prior to tagging of version 0.13.

Changelog diff is:

diff --git a/Changes b/Changes
index 766de79..b6e08d4 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,11 @@ Revision history for Perl extension App::perlbuild

 {{$NEXT}}

+0.13 2013-03-29T23:46:30Z
+
+    - add to support build-dir command-line option
+      (typester)
+
 0.12 2013-03-28T07:52:13Z

     - packaging, again.