The Uber for kids: San Fran-based Kango allows parents to order carpool rides for their kids. Sara Schaer, co-founder and CEO of Kango, explains how the company screens drivers and keeps children safe. Plus, is she afraid that Lyft or Uber will take its market share? Schaer explains what makes Kango different and how it plans to expand beyond the Bay Area. Additionally, she explains how the company may integrate self-driving technology in the future.