code: function prettySize(bytes) {
          var s = ['bytes', 'kb', 'MB', 'GB', 'TB', 'PB'];
          var e = Math.floor(Math.log(bytes)/Math.log(1024));
          return (bytes/Math.pow(1024, Math.floor(e))).toFixed(2)+" "+s[e];
      }
docs: prettySize: convert bytes to a more readable string.