Minor cleanups

Bump version 0.4.1 -> 0.4.2

Support Trio testing with Hypothesis

Bumpversion 0.4.0 -> 0.4.1

Bumpversion 0.3.0 -> 0.4.0

Pr 35 async generator

Add test_async_yield_fixture_crashed_teardown_allow_other_teardowns

This adds Python 3.5 compatibility for async fixtures.

Add 'Framework :: Trio' classifier to setup.py

Bumpversion 0.2.0 -> 0.3.0

Recursive async context managers for fixtures + nursery fixture

Bumpversion 0.1.1 -> 0.2.0

Fix coverage not covering module init

Remove unused imports

Remove no-longer-relevant text from CHEATSHEET.rst

Add newsfragment for #17

Remove unused_tcp_port{,_factory} fixtures

Heavy improvements, add async yield fixture, fix bugs, add tests etc.

Small cleanups

Closes gh-11

We made traceback.format_exception work instead.

Trio's style is to refer to async functions as "async functions", and
avoid the word "coroutine"...

Delete some stray files

Attempt to fix docs

Add CONTRIBUTING.md and CODE_OF_CONDUCT.md

Once my other PRs are merged, I think we'll have finished doing
everything listed in the CHEATSH...

plugin.py appears to be a stray copy of pytest_trio/plugin.py

Pipfile is designed for standalon...