Use "address" not "device_address" for specifying the I2C address, for consistency with other drivers

[deshipu]

We need a consistent API between different drivers, and all I2C-based drivers should use the same keywords.

[tannewt]

I'd rather move to device_address so it doesn't get confused with memory address.

[deshipu]

Well, that would involve changing a lot of code out there. And I think the context is pretty clear here.

[tannewt]

Ok, address is fine.

[kattni]

This was fixed by #13 . Closing.