Upgrade D3 to 3.4.6

This is the latest upstream version, available at this URL: https://github.com/mbostock/d3/releases/tag/v3.4.6
2014-04-28 17:41:18 +12:00 · 2014-04-28 17:41:18 +12:00 · 9ef2ad2de0
--- a/data/d3/LICENSE
+++ b/data/d3/LICENSE
@ -1,4 +1,4 @@
-Copyright (c) 2013, Michael Bostock
+Copyright (c) 2010-2014, Michael Bostock
 All rights reserved.

 Redistribution and use in source and binary forms, with or without
--- a/data/d3/d3.min.js
+++ b/data/d3/d3.min.js