add functional tests for recurring todos

includes a test for rec todos with due date in future and show_from in past

lib/authenticated_test_helper.rb

@@ -3,7 +3,7 @@ module AuthenticatedTestHelper
   def login_as(user)
     @request.session['user_id'] = user ? users(user).id : nil
   end
-  
+
   def content_type(type)
     @request.env['Content-Type'] = type
   end