Toothpick

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* fixed: a bunch of distutils/versioning issues, to get back in sync on Pypi.

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* fixed: re-ordered deletion of foreign keys from association deletions, in
similar support for modification hooks as insertion ordering described

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* added: `RESTfulResource.path` may now be a callable. If so, it is called
on-demand with the query as the sole argument, and should produce the proper
path for the query. It may produce a path containing interpolation symbols,
as the path is still interpolated with the query if necessary.
* fixed: re-ordered setting of foreign key with association insertions, fixing
modification hooks on the data field.
* fixed: `JSONResource` now sets a json Content-Type header for all actions.

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* fixed: better repr for Resource objects that are registered on a model.
* added: added support for inheriting associations.

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* added: support for specifying a query_generator to be used for query lookups
instead of resource names (supports the ability to use different resources
for association lookup than normal find* calls).

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* fixed: `toothpick.wtforms.populate()` now ignores the `csrf_token` field in
forms when populating objects.
* fixed: incorrect behavior in `Basesave(exception=False).