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/dijit/themes/claro/compile.js

@@ -5,7 +5,7 @@
 
 var fs = require('fs'),		// file system access
 	path = require('path'),	// get directory from file name
-	less = require('../../../util/less');	// less processor
+	less = require('../../../util/less/lib/less');	// less processor
 
 var options = {
 	compress: false,