Checking in changes prior to tagging of version 2.16.

Changelog diff is:

diff --git a/Changes b/Changes
index fbf15ba..f3e6ef1 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,13 @@ Revision history for Perl extension Furl

 {{$NEXT}}

+2.16 2013-05-22T07:48:21Z
+
+    - Fix timeout problem(#56) on recent Linux(3.8 or later)
+      (syohex)
+    - Added Furl::Request#as_string
+      (tokuhirom)
+
 2.15 2013-05-10T08:40:10Z

     - Added Furl::Response#as_string.