Tri.query

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* Fixed `multi_choice_queryset` when selecting multiple items and also filtering on some other field at the same time.

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* Make `Variable` shortcuts compatible with subclassing

* Use the new major tri.declarative, and update to follow the new style of class member shortcuts

* Added missing `Variable.multi_choice` shortcut

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* Fixed `multi_choice_queryset` when selecting multiple items and also filtering on some other field at the same time.

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* Make Variable shortcuts compatible with subclassing

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* http endpoint for query validation errors: `query/errors`

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* Support searching for quotation mark