Pygatt

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- Improvement: Convert documentation to RST for better PyPI integration.

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- Fix: Support platforms without ``termios`` (Windows)
- Feature: Add ``char_read_handle`` to GATTTool backend.
- Improvement: Warn if ``hcitool`` requires a sudo authentication.
- Improvement: Allow BGAPI device more time to reboot for more reliable
discovery.
- Improvement: Interpret "invalid file descriptor" as a disconnect
event.
- Fix: Correctly handle service class UUIDs that aren't 16 bytes.
- Improvement: Support BLE devices with any UTF8 character.
- Improvement: Make gatttol prompt timeout configurable.
- Improvement: Gracefully stop ``lescan`` to avoid leaving the adapter
in a bad state.
- Improvement: Allow custom timeout for discovery on GATTTool backend.
- Fix: Make sure responses to char reads on BGAPI backend are from the
requested handle.
- Improvement: Raise and exception if trying to instantiate the
GATTTool backend in Windows.
- Improvement: If no BGAPI device attached, abort immediately.
- Fix: Use user's configured HCI device for connection and scanning in
GATTTool backend.

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- [API Change] The BGAPIBackend.connect method now takes the same
``address_type`` argument as the GATTTool backend [BGAPI].
- [API Change] The ``address_type`` argument on both backends now
requires a value from a new enum, ``pygatt.BLEAddressType``, instead
of a string.
- Made Python 3 support a priority for both GATTTOOL and BGAPI
backends.
- Improve reliability of BGAPI backend by re-setting device for each
connection.

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- Added all standard GATT characteristics. [BGAPI]
- Move gatttool monitor to a background thread for increased
performance. [GATTTOOL]

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- Feature: Allow unsubscribing from notifications.
- Improvement: Allow more time to discover characteristics. [GATTTOOL]
- Improvement: Allow using gatttol backend without root. [GATTTOOL]
- Improvement: Standardize type of UUID so comparison always works (str
vs unicode)
- Fix: Fix packaging so the version on PyPI can be installed.
- Fix: Fix Python 3 compatibility.

Thanks to Ilya Sukhanov and Alexey Roslyakov for the changes in this
release!

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- New API with support for multiple BLE adapters.