Formasaurus

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* Support for scikit-learn < 0.18 is dropped;
* Formasaurus is no longer tested with Python 3.3;
* tests are fixed to account for upstream changes; Python 3.6 build is enabled.

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* more annotated data for captchas;
* ``formasaurus init`` command which trains & caches the model.

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* pip bug with ``pip install formasaurus[with-deps]`` is worked around;
it should work now as ``pip install formasaurus[with_deps]``.

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* fixed API documentation at readthedocs.org

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* more annotated data;
* new ``form_classes`` and ``field_classes`` attributes of FormFieldClassifer;
* more robust web page encoding detection in ``formasaurus.utils.download``;
* bug fixes in annotation widgets;

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* ``fields=False`` argument is supported in ``formasaurus.extract_forms``,
``formasaurus.classify``, ``formasaurus.classify_proba`` functions and
in related ``FormFieldClassifier`` methods. It allows to avoid predicting
form field types if they are not needed.
* ``formasaurus.classifiers.instance()`` is renamed to
``formasaurus.classifiers.get_instance()``.
* Bias is no longer regularized for form type classifier.