Adafruit-circuitpython-ds3231

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-ds3231`.

Read the [docs](http://circuitpython.readthedocs.io/projects/ds3231/en/latest/) for info on how to use it.

- Added `setup.py`
- Added PyPI release info to `.travis.yml`
- Updated `requirements.txt`
- Added a more comprehensive `.gitignore`

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-ds3231`.

Read the [docs](http://circuitpython.readthedocs.io/projects/ds3231/en/latest/) for info on how to use it.

Thanks to sommersoft for the great work!

Thanks to brentru for the great work!

Now with less lint, including a fix to the example. Thanks mrmcwethy !

To use in CircuitPython, simply install the [Adafruit CircuitPython bundle](https://github.com/adafruit/Adafruit_CircuitPython_Bundle/releases) or the zip from here that matches the version of CircuitPython you are using.

Read the [docs](https://circuitpython.readthedocs.io/projects/ds3231/en/latest/README.html) for info and examples.

Changes made to follow changes in Adafruit_Circuitpyton_BusDevice.I2CDevice