Checking in changes prior to tagging of version 0.13.

Changelog diff is:

diff --git a/Changes b/Changes
index f875b43..f767e3e 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,10 @@ Revision history for Perl extension WWW-Form-UrlEncoded-XS

 {{$NEXT}}

+0.13 2014-02-18T07:56:41Z
+
+    - supports a delimiter parameter
+
 0.12 2014-02-18T03:11:35Z

     - build_urlencoded supports hashref and arrayref arguments