Boycotts, controversy over Tsarneav Rolling Stone cover

      |The CBS News Roundup: The August cover of Rolling Stone featuring suspected Boston Marathon bomber Dzhokar Tsarnaev is causing a tidal wave of backlash; a Pakistani Taliban leader sends a letter to Malala Yousafzai; Nelson Mandela's daughter says he has made "dramatic" progress -- all this and more. Nick Dietz reports on the news you need to know.