Gocept-pytestlayer

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- Support Python 3.6 and PyPy3.

- Fix tests to run with `pytest >= 3.5.0`.

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- Make installation process compatible with `setuptools >= 30.0`.

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- Fix tests to pass if `pytest >= 3.0` is used for testing.

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- Support Python 3.4, 3.5 and PyPy.

- Use tox as testrunner.

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- Claim compatibility with py.test 2.9.x.

- Drop Python 2.6 support.

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- Update handling of keywords and doctest testnames for py.test-2.5.
[wosc]

- Re-introduce ``gocept.pytestlayer.fixture.create()`` method, to allow giving
created fixtures a non-random name, so other fixtures can depend on them.
[tlotze, wosc]

- Generate session-scoped fixtures from layers in addition to class-scoped
ones, if a session-scoped one is required somewhere, the class-scoped ones
are simply ignored. [tlotze, wosc]