timestamp = function(){
  var date = new Date();
  var year = date.getFullYear();
  var month = date.getMonth() + 1;
  var day = date.getDate();
  var hour = date.getHours();
  var minute = date.getMinutes();
  var second = date.getSeconds();
  var millis = date.getMilliseconds();

  year = year.toString().substr(2);
  month = ("00" + month).substr(-2, 2);
  day = ("00" + day).substr(-2, 2);
  minute = ("00" + minute).substr(-2, 2);
  second = ("00" + second).substr(-2, 2);

  return [year, month, day, "_", hour, minute, second, "_", millis].join('');
}
Returns neatly formated timestamp e.g. "151025_172441_790"

@method timestamp
@return {String} formated timestamp