Django-fractions

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* Stop subclassing Django's DecimalField and duplicate small amounts of code
as necessary for db backend compatibility. Too many things need to be
handled differently. Main cause of major version bump.
* Update forms.FractionField to skip over max_digits and decimal_places kwargs which
will get passed in by models.fields.DecimalFractionField
* Add models.fields.DecimalFractionField.formfield() so that a
forms.FractionField will be used by default
* Fix quantity_to_decimal and quantity_to_fraction to strip leading and trailing
spaces before pattern matching and converting to a decimal or fraction
* Allow for leading negative sign with forms.FractionField input values
* Fix is_fraction() to allow leading negative sign
* Add `max_digits` and `decimal_places` params to DecimalFractionField in test model
* Additional test cases for models.fields.DecimalFractionField

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* Added djfractions.models.DecimalFractionField which stores fractions.Fraction values as decimals in the dataase.
* Better usage of tox to test against different Python and Django versions
* Added testing against Django 1.10

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* Fixed boolean logic for when to coerce values to thirds in
in forms.DecimalFractionField and get_fraction_parts()

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* HISTORY.rst typo fixes
* pypi release version fix

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* Added forms.FractionField which returns fractions.Fraction instances
* Refactoring of common code with new forms.FractionField
* Smarter checking for numeric types throughout the code
* forms.DecimalFractionField.to_python() handles fractions.Fraction values now
* Fixed bug handling negative numbers in quantity_to_decimal()
* Added min_value and max_value to forms.DecimalFractionField
* Made coerce_thirds, limit_denominator, and use_mixed_numbers params to DecimalFractionField
proper named parameters and not just kwargs.

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* Fixed typo in usage docs