Sphinxcontrib-httpexample

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- Fix issue where it was not possible to request exmples with
float values in payload JSON [fixes 42]
[datakurre]

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- Add support of the URL query parameters, using the `query` field.
Given a line `:query param_name: param_value` in an http example
directive, the key value pair `param_name`, `param_value` will be
added to the request URL (and excluded from further processing).
[ludaavics]

Example::

GET /items HTTP/1.1
Host: localhost
Accept: application/json
Authorization: Basic dXNlcjpwYXNzd29yZA==

:query from: 20170101
:query to: 20171231
:query user_id: 12
:query limit: 20
:query sort: date(asc)

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- Fix packaging to include setup.cfg in sdist
[datakurre]
- Add the guillotina docs (which now uses httpexample)
[cdevienne]

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- Add support for inlining responses
[cdevienne]

------------------

- Fixed error when parsing top level json lists
[AWhetter]

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- Fix to not strip out Accept/Content-Type headers in builders
[dokai]

- Improve logic to detect a JSON content type
[dokai]

- Use redirected input to pass request payload to httpie
[dokai]

- Fix quoting of non-trivial HTTP headers in builders
[dokai]

- Change to use declarative packaging (setup.cfg instead of setup.py)
[datakurre]