Flaky

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- Officially support and test on Python 3.6 and 3.7.
- Adds a pytest marker that can be used instead of flaky``.
- Replaced references to 'slaveoutput', where possible
with 'workeroutput', following the convention chosen by pytest.
- Prints formatted tracebacks in the flaky report when using nose.

**Bugfixes**
- Ensure that tests are only reported as successful to the nose runner once.

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- Updated references to pytest instead of py.test.

**Bugfixes**
- Flaky is now compatible with pytest >= 4.1.

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**Bugfixes**
- Flaky for pytest will no longer silently swallow errors that occur during test setup.

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- Flaky for Nose will now rerun tests using the ``afterTest`` plugin hook, rather than the ``stopTest`` hook.
The ``afterTest`` hook is called slightly later in the test run process; this change allows flaky to be used
with `TestCase` subclasses that override the test run process, and do teardown after ``stopTest`` is called.
In particular, this means that flaky is now compatible with Django's ``LiveServerTestCase``.

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- Flaky will completely suppress the flaky report if ``--no-success-flaky-report`` is specified and no tests
needed to be rerun.

**Bugfixes**
- Flaky will no longer cause ``py.test --pep8`` to fail.

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- Flaky's automated tests now include a run with the ``pytest-xdist`` plugin enabled.
- Flaky for pytest has slightly changed how it patches the runner. This simplifies the plugin code a bit, but,
more importantly, avoids reporting test retries until flaky is done with them. This *should* improve compatibility
with other plugins.