Adafruit-circuitpython-hid

* Add standard `__version__` and `__repo__` to `__init__.py`, so we can identify the library version easily when it's frozen.

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-hid`.

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

* Fix negative mouse moves for CP 4.x and above.

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-hid`.

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

* Correct struct format to correct signed-ness.

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-hid`.

Read the [docs](http://circuitpython.readthedocs.io/projects/hid/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, `pip install adafruit-circuitpython-hid`.

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

- Add `ConsumerControlCode.MUTE`.

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-hid`.

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

Add `Keycode` names that correspond to Mac and Windows keyboard labels, for more obvious use without having to refer to the documentation.

- Add `Keycode.WINDOWS` and `Keycode.COMMAND` as aliases for `Keycode.GUI`.
- Add `Keycode.OPTION` as alias for `Keycode.ALT`.

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-hid`.

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