Tri-form

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* Changed Form.from_model method to require database field kwargs under `field__` namespace. This is a breaking change.

* Fixed saving of foreign keys in django create view

* Enable mixing column definitions in both declared fields and class meta.

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* Fix table mode render in python 2

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* Fixed radio button render

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* Added python 3 support

* Added render helper functions for reuse by tri.table et al

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* Fixed many_to_one field

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* Add support for Django 1.8