Adafruit-circuitpython-pn532

* Update example for I2C/SPI use case. Thanks xon235

To use in CircuitPython, simply install the [Adafruit CircuitPython bundle](https://github.com/adafruit/Adafruit_CircuitPython_Bundle).

To use in CPython, `pip3 install adafruit-circuitpython-pn532`.

Read the [docs](http://circuitpython.readthedocs.io/projects/pn532/en/latest/) for info on how to use it.

- Patch to fix issue with SPI reading in timeout loop. Thanks tgikal for the fix!

To use in CircuitPython, simply install the [Adafruit CircuitPython bundle](https://github.com/adafruit/Adafruit_CircuitPython_Bundle).

To use in CPython, `pip3 install adafruit-circuitpython-pn532`.

Read the [docs](http://circuitpython.readthedocs.io/projects/pn532/en/latest/) for info on how to use it.

- New example file for using the Mifare cards.

To use in CircuitPython, simply install the [Adafruit CircuitPython bundle](https://github.com/adafruit/Adafruit_CircuitPython_Bundle).

To use in CPython, `pip3 install adafruit-circuitpython-pn532`.

Read the [docs](http://circuitpython.readthedocs.io/projects/pn532/en/latest/) for info on how to use it.

Example filenames are now Adabot Approved. Thanks dherrada.

To use in CircuitPython, simply install the [Adafruit CircuitPython bundle](https://github.com/adafruit/Adafruit_CircuitPython_Bundle).

To use in CPython, `pip3 install adafruit-circuitpython-pn532`.

Read the [docs](http://circuitpython.readthedocs.io/projects/pn532/en/latest/) for info on how to use it.

Updates a couple examples for correctness. Thanks to jerryneedell, Tasm-Devil and ladyada

To use in CircuitPython, simply install the [Adafruit CircuitPython bundle](https://github.com/adafruit/Adafruit_CircuitPython_Bundle).

To use in CPython, `pip3 install adafruit-circuitpython-pn532`.

Read the [docs](http://circuitpython.readthedocs.io/projects/pn532/en/latest/) for info on how to use it.

To use in CircuitPython, simply install the [Adafruit CircuitPython bundle](https://github.com/adafruit/Adafruit_CircuitPython_Bundle).

To use in CPython, `pip3 install adafruit-circuitpython-pn532`.

Read the [docs](http://circuitpython.readthedocs.io/projects/pn532/en/latest/) for info on how to use it.