Checking in changes prior to tagging of version 1.28.

Changelog diff is:

diff --git a/Changes b/Changes
index 1735cb7..92715fb 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,12 @@ Revision history for Perl extension Test::TCP

 {{$NEXT}}

+1.28 2013-05-28T11:14:27Z
+
+    - Added wait_port_sleep and wait_port_retry option for
+      Test::TCP::wait_port, Test::TCP#new, test_tcp().
+      (tokuhirom)
+
 1.27 2013-05-15T10:13:18Z

     - export wait_port from Net::EmptyPort