Fixes #627. Applied the patch with changes. Only the guid is changed, not the link to the context. Thanks Tommi

git-svn-id: http://www.rousette.org.uk/svn/tracks-repos/trunk@700 a4c988fc-2ded-0310-b66e-134b36920a42

tracks/app/controllers/todos_controller.rb

@@ -524,6 +524,7 @@ class TodosController < ApplicationController
                                     :item => {
                                                 :title => :description,
                                                 :link => lambda { |t| context_url(t.context) },
+                                                :guid => lambda { |t| todo_url(t) },
                                                 :description => todo_feed_content
                                              }
       end