Dawg

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* Wrapper is rebuilt with Cython 0.21dev;
* Python 3.4 compatibility is verified.

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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- bitbucket mirror is no longer maintained.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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- Installation issues in environments with LC_ALL=C are fixed;
- PyPy is officially unsupported now (use DAWG-Python_ with PyPy).

.. _DAWG-Python: https://github.com/pytries/DAWG-Python

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