Dawg-python

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- minor speedup;
- bitbucket mirror is no longer maintained.

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- Switch to setuptools;
- upload wheel tp pypi;
- check Python 3.4 compatibility.

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IntDAWG and IntCompletionDAWG are implemented.

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Use less shared state internally. This should fix thread-safety bugs and
make iterkeys/iteritems reenterant.

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Internal tweaks: memory usage is reduced; something is a bit faster,
something is a bit slower.

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Storage scheme is updated to match DAWG==0.5. This enables
the alphabetical ordering of ``BytesDAWG`` and ``RecordDAWG`` items.

In order to read ``BytesDAWG`` or ``RecordDAWG`` created with
versions of DAWG < 0.5 use ``payload_separator`` constructor argument::

>>> BytesDAWG(payload_separator=b'\xff').load('old.dawg')