* Note that `gui__class` to specify a constructor/callable is no longer a valid parameter, because of updated tri.form. Use `gui__call_target` or just `gui`.
* You no longer need to specify the `model` parameter to `choice_queryset` or `multi_choice_queryset` if you give it a `QuerySet` as `choices` (as opposed to giving a callable)
3.3.0
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* Move default behaviors out from the shortcuts so they can be used externally
* Removed jquery dependency for toggling simple/advanced filtering
* Removed support for Django 1.7
3.2.0
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* `Variable` class now inherits from `object`, making the implementation more pythonic. (Attributes still possible to override in constructor call, see `NamespaceAwareObject`)
3.1.0
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* Moved to the simplified factory system for `from_model`
* Added shortcuts to `Variable`: url, time, datetime, date, email, decimal
3.0.0
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* Updated to latest major tri.form
2.2.0
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* Variable.choice_queryset handles the string "null" the same way as everything else