Adafruit-circuitpython-trellis

- 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-trellis`.

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

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