Checking in changes prior to tagging of version 0.15.

Changelog diff is:

diff --git a/Changes b/Changes
index 5b8b88c..db4a2d2 100644
--- a/Changes
+++ b/Changes
@@ -1,5 +1,8 @@
 Revision history for Perl extension Plack::Middleware::ReverseProxy

+0.15    Mon Jan  7 15:59:54 PST 2013
+        - Cut down dependencies for tests (kazeburo)
+
 0.14    Sat May 26 20:19:23 PDT 2012
         - Fixed Plack dependency