Gocept.httpserverlayer

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- 1.4.0 was a brown-bag, let's try again.

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- Make HTTP server and thread objects used by layers available as a resource.

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- Replace dependency on ``distribute`` with ``setuptools``, since the projects have merged.

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- Fix custom layer test tear down.

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- Fixed tests run on MacOS.

- Use the `server_address` instead of `server_name` of `HTTPServer` to be
compatible with MacOS.

- Dropped compatability with Zope < 2.12.

- Removed customized `HTTPServer`, the `BaseHTTPServer.HTTPServer` does
everything we need.

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- Add ``custom.Layer`` that uses a BaseHTTPServer with a custom RequestHandler,
and ``static.Layer`` that server the contents of a directory.

- Dropped compatability with Python < 2.6.