Checking in changes prior to tagging of version 2.04.

Changelog diff is:

diff --git a/Changes b/Changes
index 86812fa..d92dad0 100644
--- a/Changes
+++ b/Changes
@@ -1,5 +1,12 @@
 Revision history for Perl extension Furl

+2.04 2013-02-12T14:28:53
+
+    [EXPERIMENTAL FEATURE]
+    - Add "Client-Warning: Internal Response" header for
+      Internal response. It's compatible with LWP.
+      (tokuhirom)
+
 2.03 2013-02-09T18:17:13

     - Support URL based authorization. Both Proxy-Authorization and Basic Authorization.