Gocept.httpserverlayer

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- Support the upcoming Zope 4 through extras_require [plonetestingz4].

- Pin `transaction < 2.0` and `ZODB < 5.0` until `Zope2` is compatible with
these releases. (See https://github.com/zopefoundation/Zope/issues/79)

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- Drop support for:

- ``zope.app.testing`` (extras_require: [zopeapptesting])

- ``Testing.ZopeTestCase`` (extras_require: [zope2testcase])

- ``plone.app.testing`` (extras_require: [test_plonetestingz2])

- ``Products.PloneTestCase`` (extras_require: [plonetestcase])

- Drop support for Python 2.6.

- Use ``tox`` as testrunner.

- Remove ``zc.buildout`` infrastructure.

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- Don't overwrite ``self.port`` when it was 0.

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- Silence "error 32: Broken pipe" errors in ``custom.Layer``, too.

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- Silence "error 32: Broken pipe" errors in ``wsgi.Layer``, they just
mean the client closed the connection prematurely, which is as
harmless as it is normal.

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- Make it possible to dictate the hostname for the httpserver via environment
variable ``GOCEPT_HTTP_APP_HOST``. You will need this if you run your tests
in a selenium grid on different machines.