Ace-sklearn-crfsuite

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* Ignore errors in ``FileResource.__del__``.

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* Added ``sklearn_crfsuite.metrics.sequence_accuracy_score()`` function and
related ``sklearn_crfsuite.scorers.sequence_accuracy``;
* ``FileResource.__del__`` method made more robust.

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* **backwards-incompatible**: ``crf.tagger`` attribute is renamed to
``crf.tagger_``; when model is not trained accessing this attribute
no longer raises an exception, its value is set to None instead.

* new CRF attributes available after training:

* ``classes_``
* ``size_``
* ``num_attributes_``
* ``attributes_``
* ``state_features_``
* ``transition_features_``

* Tutorial is added.

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Initial release.