Adafruit-circuitpython-wiznet5k

This release adds:
* https://github.com/adafruit/Adafruit_CircuitPython_Wiznet5k/pull/8 Add new example: `adafruit_wiznet5k_cheerlights`

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-wiznet5k `.

Read the [docs](http://circuitpython.readthedocs.io/projects/wiznet5k/en/latest/) for info on how to use it.

* Modified `_socket` module for compatibility with [CircuitPython Requests](https://github.com/adafruit/Adafruit_CircuitPython_Requests)
* Updated `wiznet5k_simpletest.py`.
* Added `wiznet5k_aio_post.py` example for POST'ing to adafruit.io
* Added `wiznet5k_simpletest_manual_network.py` example for manually setting up interface's network configuration.
* Fixed: `_socket` `readline` not parsing multiple lines correctly
* Fixed: `_socket`'s `recv` for UDP packets
* Fixed: `adafruit_wiznet5k_dhcp` w.r.t incorrect network configuration parsing

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-wiznet5k `.

Read the [docs](http://circuitpython.readthedocs.io/projects/wiznet5k/en/latest/) for info on how to use it.

This release adds:
* A DNS client implementation for Wiznet5k modules.
* `disconnect` to `adafruit_wiznet5k_socket` to gracefully disconnect TCP sockets.
* Close and UDP sockets created by DNS and DHCP operations once complete to allow them to be re-allocated

**NOTE**: This release is not compatible with Adafruit_CircuitPython_Requests, a future pull request will add compatibility for this library.


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-wiznet5k `.

Read the [docs](http://circuitpython.readthedocs.io/projects/wiznet5k/en/latest/) for info on how to use it.

This library provides hardware support for Wiznet 5k chipsets via a CPython `socket`-like API. This library currently only supports the WIZ5500 chipset but is extensible to other chipsets in the Wiznet W5k family.

**NOTE:** This initial alpha version of the code does not contain a DNS client. CircuitPython libraries which depend on hostname resolution such as `Adafruit_CircuitPython_Requests` will _not_ be compatible with the initial alpha release.

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-wiznet5k `.

Read the [docs](http://circuitpython.readthedocs.io/projects/wiznet5k/en/latest/) for info on how to use it.