make I2C bus_num attribute setable
make I2C bus_num attribute setable

leftbrainstrain/PyBBIO,ims-tyler/PyBBIO,graycatlabs/PyBBIO,ims-tyler/PyBBIO,ims-tyler/PyBBIO,graycatlabs/PyBBIO,graycatlabs/PyBBIO,leftbrainstrain/PyBBIO,graycatlabs/PyBBIO,leftbrainstrain/PyBBIO,leftbrainstrain/PyBBIO,leftbrainstrain/PyBBIO,ims-tyler/PyBBIO,ims-tyler/PyBBIO,graycatlabs/PyBBIO