Adafruit-circuitpython-drv2605

- 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-drv2605`.

Read the [docs](http://circuitpython.readthedocs.io/projects/drv2605/en/latest/) for info on how to use it.

Thanks to sommersoft for doing this!

Thanks to brentru for the great work!

This is the first release of this haptic motor driver. Thanks to tdicola for adding it.

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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.