code: function getDatesForBoardPinsFromRss(username, board, callback) {
      getCache(board + '_RSS', true, function (cacheData) {
          if (cacheData === null) {
              get('http://www.pinterest.com/' + username + '/' + board.replace(/#/g, '') + '.rss', false, function (response) {
                  putCache(board + '_RSS', JSON.stringify(response));
                  getPinDateMapFromBoardRssGetResponse(response, board, callback);
              });
          } else {
              getPinDateMapFromBoardRssGetResponse(cacheData, board, callback);
          }
      });
  }
docs: /*
  Get publish dates for each pin on a board based on RSS
  
  @param String board
  @param Function callback
  @invokes callback(Object pinDateMap)