low level flash access

@pk910 you can use module FlashEEPROM on Puck.js too.

// Tested on Puck.js
var f = new (require("FlashEEPROM"))();
console.log(f);
f.write(0, 'Hello Flash.');
console.log(E.toString(f.read(0)));

/* console log

{
  "flash": function () { [native code] },
  "addr": 471040, "endAddr": 475136 }

Hello Flash.

*/