This breaks any uses of 1.5.1 because it broke behavior vs 1.5.0. 1.5.1 does not energize the coils of the stepper at the start. 1.5.0 and prior versions do energize them to prevent the motor from spinning.
To use in CircuitPython, simply install the [Adafruit CircuitPython bundle](https://github.com/adafruit/Adafruit_CircuitPython_Bundle).
To use in CPython, `pip install adafruit-circuitpython-motor`.
Read the [docs](http://circuitpython.readthedocs.io/projects/motor/en/latest/) for info on how to use it.