Feature: EventLoop.run_in_executor should accept **kwargs

[penguinolog]

• Use functools.partial as noticed in upstream implementation code
• Tornado loop: undeprecate initialization

Checklist

• I've ensured that similar functionality has not already been implemented
• I've ensured that similar functionality has not earlier been proposed and declined
• I've branched off the master or python-dual-support branch
• I've merged fresh upstream into my branch recently
• I've ran tox successfully in local environment
• I've included docstrings and/or documentation and/or examples for my code (if this is a new feature)

[coveralls]

Pull Request Test Coverage Report for Build 7973811845

Details

• -5 of 11 (54.55%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.01%) to 71.286%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
urwid/event_loop/tornado_loop.py	2	7	28.57%

Totals
Change from base Build 7973514132:	-0.01%
Covered Lines:	8940
Relevant Lines:	12648

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💛 - Coveralls