Wal-Mart (WMT), the world's largest retailer, offers everyday low prices for consumers. For investors, Wal-Mart offers rising dividends and a new base. The Bentonville, Ark.-based firm seems like a poster child for an income stock. It's a big cap, it's a mature company. But it also sports steady top and bottom-line growth. Wal-Mart is a member of the S&P 500 Dividend Aristocrats index, which tracks large-cap stocks that have paid increasing