Z3c.breadcrumb

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- Bug: Fixed ``IBreadcrumbs`` to match implementation.
- Clean up dependencies.

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- Bug: Fixed the package's long description.

- Feature: Use the correct ``DocFileSuite`` class that counts tests properly.

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- Bug: Test coverage brought up to 100%.

- Feature: Register default ``IBreadcrumbs`` adapter.

- Bug: Default ``IBreadcrumbs`` stops only on virtual host root, not on
``ISite`` object

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- Initial Release