Tri.query

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* Minor bugfix for variable-from-model handling of auto fields

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* Fix over-eager assert not allowing variable-less Query objects.

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* Enable mixing variable definitions in both declared variables and class meta.

* Added `after` attribute on `Variable` to enable custom variable ordering (See `tri.declarative.sort_after()`)

* Added Variable.from_model, Query.from_model

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* Added robustness in when arguments are passed as `dict(foo=dict(bar=17))` or `foo__bar=17`

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* Add python 3 support

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* `Variable.float` shortcut added

* Add support for Django 1.7 and 1.8.