Merge pull request #650 from tannewt/merge_2x3.0.0-alpha.2

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-# Adafruit CircuitPython
-
-[![Build Status](https://travis-ci.org/adafruit/circuitpython.svg?branch=master)](https://travis-ci.org/adafruit/circuitpython)
-[![Doc Status](https://readthedocs.org/projects/circuitpython/badge/?version=latest)](http://circuitpython.readthedocs.io/)
-[![Gitter](https://badges.gitter.im/adafruit/circuitpython.svg)](https://gitter.im/adafruit/circuitpython?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)
-[![Discord](https://img.shields.io/discord/327254708534116352.svg)](https://discord.gg/nBQh6qu)
-
-**[Status](#status)** |
-**[Supported Boards](#supported-boards)** |
-**[Download](#download)** |
-**[Documentation](#documentation)** |
-**[Contributing](#contributing)** |
-**[Differences from Micropython](#differences-from-micropython)** |
-**[Project Structure](#project-structure)**
-
-**Adafruit CircuitPython** is an open source derivative of
-[MicroPython](http://www.micropython.org) for use on educational
-development boards designed and sold by [Adafruit](https://www.adafruit.com).
-
-**CircuitPython**, a MicroPython derivative, implements Python 3.x on
-microcontrollers such as the SAMD21 and ESP8266.
-
-## Status
-
-This project is in beta. Most APIs should be stable going forward.
-
-## Supported Boards
-
-### Designed for CircuitPython
-
-* [Adafruit CircuitPlayground Express][]
-* [Adafruit Feather M0 Express][]
-* [Adafruit Metro M0 Express][]
-* [Adafruit Gemma M0][]
-* [Adafruit Trinket M0][]
-
-### Other
-
-* [Adafruit Feather HUZZAH][]
-* [Adafruit Feather M0 Basic][]
-* [Adafruit Feather M0 Bluefruit LE][] (uses M0 Basic binaries)
-* [Adafruit Feather M0 Adalogger][] (MicroSD card supported using the [Adafruit CircuitPython SD library](https://github.com/adafruit/Adafruit_CircuitPython_SD))
-* [Arduino Zero][]
-
-## Download
-
-Official binaries are available through the
-[latest GitHub releases](https://github.com/adafruit/circuitpython/releases).
-Continuous (one per commit) builds are available
-[here](https://adafruit-circuit-python.s3.amazonaws.com/index.html?prefix=bin)
-and includes experimental hardware support.
-
-## Documentation
-
-Guides and videos are available through the [Adafruit Learning System](https://learn.adafruit.com/)
-under the [CircuitPython category](https://learn.adafruit.com/category/circuitpython)
-and [MicroPython category](https://learn.adafruit.com/category/micropython).
-An API reference is also available on [Read the Docs](http://circuitpython.readthedocs.io/en/latest/?).
-
-## Contributing
-
-See [CONTRIBUTING.md](https://github.com/adafruit/circuitpython/blob/master/CONTRIBUTING.md)
-for full guidelines but please be aware that by contributing to this
-project you are agreeing to the [Code of Conduct][]. Contributors who
-follow the [Code of Conduct][] are welcome to submit pull requests and
-they will be promptly reviewed by project admins. Please join the
-[Gitter chat](https://gitter.im/adafruit/circuitpython) or
-[Discord](https://discord.gg/nBQh6qu) too.
-
----
-
-## Differences from [MicroPython][]
-
-CircuitPython:
-
-* includes a port for Atmel SAMD21 (Commonly known as M0
-  in Adafruit product names.)
-* supports only Atmel SAMD21 and ESP8266 ports.
-* tracks MicroPython's releases (not master).
-
-### Behavior
-
-* The order that files are run and the state that is shared between them.
-  CircuitPython's goal is to clarify the role of each file and make each
-  file independent from each other.
-  * `boot.py` (or `settings.py`) runs only once on start up before
-    USB is initialized. This lays the ground work for configuring USB
-    at startup rather than it being fixed. Since serial is not
-    available, output is written to `boot_out.txt`.
-  * `code.py` (or `main.py`) is run after every reload until it
-    finishes or is interrupted. After it is done running, the vm and hardware is
-    reinitialized. **This means you cannot read state from `code.py`
-    in the REPL anymore.** CircuitPython's goal for this change includes
-    reduce confusion about pins and memory being used.
-  * After `code.py` the REPL can be entered by pressing any key. It no
-    longer shares state with `code.py` so it is a fresh vm.
-  * Autoreload state will be maintained across reload.
-* Adds a safe mode that does not run user code after a hard crash or
-  brown out. The hope is that this will make it easier to fix code that
-  causes nasty crashes by making it available through mass storage after
-  the crash. A reset (the button) is needed after its fixed to get back
-  into normal mode.
-
-### API
-
-* Unified hardware APIs:
-  [`audioio`](https://circuitpython.readthedocs.io/en/latest/shared-bindings/audioio/__init__.html),
-  [`analogio`](https://circuitpython.readthedocs.io/en/latest/shared-bindings/analogio/__init__.html),
-  [`busio`](https://circuitpython.readthedocs.io/en/latest/shared-bindings/busio/__init__.html),
-  [`digitalio`](https://circuitpython.readthedocs.io/en/latest/shared-bindings/digitalio/__init__.html),
-  [`pulseio`](https://circuitpython.readthedocs.io/en/latest/shared-bindings/pulseio/__init__.html),
-  [`touchio`](https://circuitpython.readthedocs.io/en/latest/shared-bindings/touchio/__init__.html),
-  [`microcontroller`](https://circuitpython.readthedocs.io/en/latest/shared-bindings/microcontroller/__init__.html),
-  [`board`](https://circuitpython.readthedocs.io/en/latest/shared-bindings/board/__init__.html),
-  [`bitbangio`](https://circuitpython.readthedocs.io/en/latest/shared-bindings/bitbangio/__init__.html) (Only available on atmel-samd21 and ESP8266 currently.)
-* No `machine` API on Atmel SAMD21 port.
-
-### Modules
-
-* No module aliasing. (`uos` and `utime` are not available as `os` and
-  `time` respectively.) Instead `os`, `time`, and `random` are CPython
-  compatible.
-* New `storage` module which manages file system mounts. (Functionality
-  from `uos` in MicroPython.)
-* Modules with a CPython counterpart, such as `time`, `os` and `random`,
-  are strict [subsets](https://circuitpython.readthedocs.io/en/latest/shared-bindings/time/__init__.html)
-  of their [CPython version](https://docs.python.org/3.4/library/time.html?highlight=time#module-time).
-  Therefore, code from CircuitPython is runnable on CPython but not
-  necessarily the reverse.
-* tick count is available as [`time.monotonic()`](https://circuitpython.readthedocs.io/en/latest/shared-bindings/time/__init__.html#time.monotonic)
-
-### atmel-samd21 features
-
-* RGB status LED
-* Auto-reload after file write over mass storage. (Disable with
-  `samd.disable_autoreload()`)
-* Wait state after boot and main run, before REPL.
-* Main is one of these: `code.txt`, `code.py`, `main.py`, `main.txt`
-* Boot is one of these: `settings.txt`, `settings.py`, `boot.py`,
-  `boot.txt`
-
----
-
-## Project Structure
-
-Here is an overview of the top-level source code directories.
-
-### Core
-
-The core code of [MicroPython][] is shared amongst ports including
-CircuitPython:
-
-* `docs` High level user documentation in Sphinx reStructuredText
-  format.
-* `drivers` External device drivers written in Python.
-* `examples` A few example Python scripts.
-* `extmod` Shared C code used in multiple ports' modules.
-* `lib` Shared core C code including externally developed libraries such
-  as FATFS.
-* `logo` The MicroPython logo.
-* `mpy-cross` A cross compiler that converts Python files to byte code
-  prior to being run in MicroPython. Useful for reducing library size.
-* `py` Core Python implementation, including compiler, runtime, and
-  core library.
-* `shared-bindings` Shared definition of Python modules, their docs and
-  backing C APIs. Ports must implement the C API to support the
-  corresponding module.
-* `shared-module` Shared implementation of Python modules that may be
-  based on `common-hal`.
-* `supervisor` Code and headers related to the supervisor which monitors and
-  runs individual MicroPython virtual machines (from code in `py`).
-* `tests` Test framework and test scripts.
-* `tools` Various tools, including the pyboard.py module.
-
-### Ports
-
-Ports include the code unique to a microcontroller line and also
-variations based on the board.
-
-* `ports/atmel-samd` Support for SAMD21 based boards such as [Arduino Zero][],
-  [Adafruit Feather M0 Basic][], and [Adafruit Feather M0 Bluefruit LE][].
-* `ports/bare-arm` A bare minimum version of MicroPython for ARM MCUs.
-* `ports/cc3200` Support for boards based [CC3200](http://www.ti.com/product/CC3200)
-  from TI such as the [WiPy 1.0](https://www.pycom.io/solutions/py-boards/wipy1/).
-* `ports/esp8266` Support for boards based on ESP8266 WiFi modules such as the
-  [Adafruit Feather HUZZAH][].
-* `ports/minimal` A minimal MicroPython port. Start with this if you want
-  to port MicroPython to another microcontroller.
-* `ports/pic16bit` Support for 16-bit PIC microcontrollers.
-* `ports/qemu-arm` Support for ARM emulation through [QEMU](https://qemu.org).
-* `ports/stm32` Support for boards based on STM32 microcontrollers including
-  the MicroPython flagship [PyBoard](https://store.micropython.org/store/#/products/PYBv1_1).
-* `ports/teensy` Support for the Teensy line of boards such as the
-  [Teensy 3.1](https://www.pjrc.com/teensy/teensy31.html).
-* `ports/unix` Support for UNIX.
-* `ports/windows` Support for [Windows](https://www.microsoft.com/en-us/windows/).
-* `ports/zephyr` Support for [Zephyr](https://www.zephyrproject.org/), a
-  real-time operating system by the Linux Foundation.
-
-CircuitPython only maintains the `atmel-samd` and `esp8266` ports. The
-rest are here to maintain compatibility with the
-[MicroPython][] parent project.
-
-**[⬆ back to top](#adafruit-circuitpython)**
-
-[Adafruit CircuitPlayground Express]: https://www.adafruit.com/product/3333
-[Adafruit Feather M0 Express]: https://www.adafruit.com/product/3403
-[Adafruit Metro M0 Express]: https://www.adafruit.com/product/3505
-[Adafruit Gemma M0]: https://www.adafruit.com/product/3501
-[Adafruit Trinket M0]: https://www.adafruit.com/product/3500
-[Adafruit Feather HUZZAH]: https://www.adafruit.com/products/2821
-[Adafruit Feather M0 Basic]: https://www.adafruit.com/products/2772
-[Adafruit Feather M0 Bluefruit LE]: https://www.adafruit.com/products/2995
-[Adafruit Feather M0 Adalogger]: https://www.adafruit.com/product/2796
-[Arduino Zero]: https://www.arduino.cc/en/Main/ArduinoBoardZero
-[MicroPython]: https://github.com/micropython/micropython
-[Code of Conduct]: https://github.com/adafruit/circuitpython/blob/master/CODE_OF_CONDUCT.md