Feature request: readRaw()

[oschade]

Thank you for your great library!
I want to read the whole scratchpad from an OneWire sensor, for example:

con.read("/28.0000B218DA00/scratchpad", function(err, result){
  console.log( result )
})

Sadly, your library converts every payload to an utf8-String. Because the scratchpad of the sensor is no valid utf-8 string, some bytes get lost and there is no way to get them back.
It would be great if there is a function like "readRaw", which bypassed every string conversion in the code.

Background:
I simulate a DS18B20 with an arduino and the library "OneWireHub" and modify some bytes to get a higher resolution. To get this modifed bytes, I need to read the full "scratchpad".