Marisa-trie-m

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* Rebuild wrapper with Cython pre-0.18;
* update benchmarks.

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* Update bundled marisa-trie C++ library (this may fix more mingw issues);
* Python 3.3 support is back.

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* much faster (3x-7x) ``.items()`` and ``.keys()`` methods for all tries;
faster (up to 3x) ``.prefixes()`` method for ``Trie``.

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* Pickling of RecordTrie is fixed (thanks lazarou for the report);
* error messages should become more useful.

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* Issues with mingw32 should be resolved (thanks Susumu Yata).

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* ``.get(key, default=None)`` method for ``BytesTrie`` and ``RecordTrie``;
* small README improvements.