title: Open, create files and save data in client side and reuse that data
body: <p>I am creating a chrome app with plain javascript and bootstrap. Initially user have to give some data and app keeps that data and reuse that for next times. I think I have to store that 
  data in a file. Can I use the plain javascript file IO to do that or is there a special way to do it in chrome-style. (Because some features are disabled in packaged apps)</p>