Checking in changes prior to tagging of version 0.19.

Changelog diff is:

diff --git a/Changes b/Changes
index 411c83c..97f3093 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,10 @@ Revision history for Perl extension App::perlbuild

 {{$NEXT}}

+0.19 2013-05-16T02:17:08Z
+
+    - no feature changes
+
 0.18 2013-05-16T01:51:30Z

     - Support --jobs for parallel building.