Bh1745

Migrate to new i2cdevice>=0.0.6 set/get API. For more information see: https://github.com/pimoroni/i2cdevice-python/pull/3

Some final improvements to mark the first stable release.

* Automagically call setup if not called by user
* Allow `setup()` to try alternate i2c addresses
* Added `.ready()` to determine if sensor is setup

See the `detect.py` example for how you might use these changes in a project.

Bumped i2cdevice version dependency to 0.0.4 to ensure Python2/3 compatibility.