Add .json file as allowed

Author: Vitaly Bevzik

lib/util.js

@@ -9,7 +9,7 @@ function getFilesFromDisk(subdir) {
     var filesOnDisk = [];
 
     // Only iterate through supported .js, .gs and .html files in dir
-    dir.readFiles(subdir, { match: /.js$|.gs$|.html$/ },
+    dir.readFiles(subdir, { match: /.js$|.gs$|.json$|.html$/ },
       // Invoke this callback on each file
       function(err, content, filename, next) {
         if (err) return reject(err);