Adafruit-circuitpython-lis3dh

- 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-lis3dh`.

Read the [docs](http://circuitpython.readthedocs.io/projects/lis3dh/en/latest/) for info on how to use it.

Made code changes to shrink the size of the library by about 400 bytes. No functionality changed.

Updated to check for collections before importing ucollections.

Thanks to jerryneedell for testing!

Thanks to Sigafoos for the great work!

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

Thanks to sommersoft for the great work!