anchor.diff:  
   handle_cast(_Msg, State) ->
       {noreply, State}.
  -
  -handle_info(check_for_updates, #state{feeds=Feeds}=State) ->
  -    io:format("Checking for updates~n"),
  -    check_for_updates(Feeds),
  -    erlang:send_after(?INTERVAL, self(), check_for_updates),
  -    {noreply, State};
   
   handle_info(_Msg, State) ->
       {noreply, State}.
  
positive.code: 
  import_feed_list(User, File) ->
      gen_server:call(?MODULE, {import, User, File}).
  
  list_feeds() ->
      gen_server:call(?MODULE, list).
  
  update() ->
      gen_server:call(?MODULE, update).
  
  update_feed(Uri) ->
      gen_server:call(?MODULE, {update_feed, Uri}).
  
  get_all_feeds(Feeds) ->
      lists:map(fun({_,Feed}) -> Feed end, Feeds).
  
  add_user_to_feed(User, Uri) ->
      gen_server:call(er_user_feeds, {add, User, Uri}).
  
negative.code:                 {error, Error} -> {Error, Feeds}
              end
      end.
  