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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.