Poultry

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* The ``media`` command outputs the CSV header and the ``source_status_id`` field.

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* Python 2 is not supported anymore.
* Use the ``full_text`` field to retrieve tweet's text, fall back to ``text`` if
it's not available.
* ``language`` filtering predicate.
* The ``--mode`` parameter for the ``filter`` subcommand that sets the file opening
mode. Use `w` to rewrite the files and `a` (the default) to append.
* The ``-u`` (force UTF-8 output) option is removed. ``--output`` and
``--encoding`` are added instead.
* The South-West point of tweet's place is used if its coordinate is not provided.
* The ``Tweet.bounding_box`` property is introduced, it is always a polygon.
* The ``--filters`` option for ``filter`` to define what filters are used.
* Refactored communication with Twitter and internal stream handling.
* New ``media`` command.

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* The ``poultry.readline_dir()`` generator iterates over a collection of tweets
and yields ``Tweet`` objects.

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* Windows support.
* ``-o`` option for ``text`` to print tweets to a file.

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* Conda support.

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* Python 3 support.