suggested functionality for I2Cdev::readWords

[mogar]

I'm using I2Cdev with an IC that has a slightly non-standard interface. When reading from the chip, it expects a request in the form: chip address, register address, then data. It doesn't perform a STOP on the bus before reading in the data.

I2Cdev does everything I need, but when reading words it ends the connection after setting the register address and then starts a new connection, sends the chip address again, and then gets data.

I'd like to adapt the library by adding an optional stop input to readWords() that would change lines 418 and 419 to:

Wire.endTransmission(stop);
if (!stop) Wire.beginTransmission(devAddr);

If you'd be ok with this, I can open up a PR for it.