lib: Upgrade Dojo and Dijit from 1.8.3 to 1.12.1

The itemNode and expandoNode elements have changed from img to
span (https://bugs.dojotoolkit.org/ticket/16699), so we now put our
tree icons inside them rather than replacing them.

Signed-off-by: Anders Kaseorg <andersk@mit.edu>

lib/dojo/tests.js

@@ -0,0 +1,13 @@
+//This file is the command-line entry point for running the tests in
+//Rhino and Spidermonkey.
+
+/*=====
+dojo.tests = {
+	// summary:
+	//		D.O.H. Test files for Dojo unit testing.
+};
+=====*/
+
+load("dojo.js");
+load("tests/runner.js");
+tests.run();