Add readWaitForBytes.

Wait for N bytes to read from serial port.

Signed-off-by: Dmitry Gryazin <dosagc@gmail.com>
setReadTimeout is final now.

Signed-off-by: Dmitry Gryazin <dosagc@gmail.com>
Package renamed into dosagc.serialport

Signed-off-by: Dmitry Gryazin <dosagc@gmail.com>