The lazy days of summer are just around the corner. School gets out soon. Kids are signing up for Little League and swimming lessons...but there's still lots of time to fill. To keep kids mentally stimulated through the summer months, many parents turn to books. But finding the right book, at the right time in a child's life, can be a challenge. A new children's literary magazine, published in St. Paul, aims to take the guess work out of finding good kids' books. Editor Martha Davis Beck, says the "Riverbank Review" is for parents who don't have a lot of extra time or literary expertise: Martha Davis Beck is editor of Riverbank Review which will publ