Brother, can you spare a nickel? For roughly half of American households they answer is "barely," according to the results of a new survey by Bankrate.com. About half reported they are setting aside no more than 5 percent of their income in savings. One in five said they're not even able to save a penny. The highest savings rates were reported by those in the middle of the income ladder; more than a third of households earnings between $50,000 - 75,000 said they're saving more than 10 percent of their incomes, a higher rate than those in the highest-income bracket....