Brownant

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- Add support to lxml >= 3.7.3. (by Caratpine)
- Compatible with pip > 7.1.2 && support Python 3.5/3.6. (by dongweiming)

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- Add JSONResponseProperty to support parsing JSON response. (by dongweiming)

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Some API will be changed without backward compatibility in next major release.

- Add support to redirect while executing request handler.
- Add support to run on Python 3.4 without any modified.
- Refactor the ``http_client`` into a pipeline property.
- Remove the magic arguments of ``http_client``
- Expose the classes in the top-level package. We can import all from
``brownant`` and ``brownant.pipeline`` now.
- Rename the ``BrownAnt`` into ``Brownant``. The ``BrownAnt`` is still usable
but not recommended.
- Fix the unicode error for URLs which included non-ascii query.
- Fix the lxml compatible problem with PyPy.

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- Fix the RequestRedirect raised problem.
- Add the new pick mode "keep" of XPathTextProperty. (by VeryCB)
- Add the encoding parameter of the ElementTreeProperty. That could let the
property provide bytes instead of unicode string. (by VeryCB)

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- Fix the broken CI (travis-ci).

============================

- Fix some unicode compatible problems for URL string.
- Prevent the invalid URL string input.
- Change the theme of document into built-in one named "nature".