Marisa-trie-m

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* Removed redundant ``DeprecationWarning`` messages in ``Trie.save`` and
``Trie.load``.
* Dropped support for Python 2.6.
* Rebuild Cython wrapper with Cython 0.28.1.

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* Fixed packaging issue, ``MANIFEST.in`` was not updated after ``libmarisa-trie``
became a submodule.

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* Added ``BinaryTrie`` for storing arbitrary sequences of bytes, e.g. IP
addresses (thanks Tomasz Melcer);
* Deprecated ``Trie.has_keys_with_prefix`` which can be trivially implemented in
terms of ``Trie.iterkeys``;
* Deprecated ``Trie.read`` and ``Trie.write`` which onlywork for "real" files
and duplicate the functionality of ``load`` and ``save``. See issue 31 on
GitHub;
* Updated ``libmarisa-trie`` to the latest version. Yay, 64-bit Windows support.
* Rebuilt Cython wrapper with Cython 0.25.2.

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* packaging issue is fixed.

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* setup.py is switched to setuptools;
* a tiny speedup;
* wrapper is rebuilt with Cython 0.22.

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* ``trie1 == trie2`` and ``trie1 != trie2`` now work (thanks Sergei Lebedev);
* ``for key in trie:`` is fixed (thanks Sergei Lebedev);
* wrapper is rebuilt with Cython 0.21.1 (thanks Sergei Lebedev);
* https://bitbucket.org/kmike/marisa-trie repo is no longer supported.