Checking in changes prior to tagging of version 2.17.

Changelog diff is:

diff --git a/Changes b/Changes
index f3e6ef1..6c3a08d 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,11 @@ Revision history for Perl extension Furl

 {{$NEXT}}

+2.17 2013-07-01T03:11:49Z
+
+    - Fix Furl::Request#as_string the request contains ARRAY or HASH.
+      (tokuhirom)
+
 2.16 2013-05-22T07:48:21Z

     - Fix timeout problem(#56) on recent Linux(3.8 or later)