Icemac.ab.importer

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- Add breadcrumbs.

- Change `zope.interface.implements[Only]` and `zope.component.adapts` to
class decorators.

- Also release as wheel.

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- Update to changes in test infrastructure in `icemac.addressbook >= 4.0`.

- Bring test coverage to 100 % including the tests themselves.

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- Update test infrastructure to `icemac.addressbook >= 3.0`.

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- Update code to support `icemac.addressbook >= 2.9`.

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- Bring branch test coverage to 100 %.

- Adapt configuration of user roles and code to `icemac.addressbook >= 2.9`.

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- Update to ``bootstrap.py`` from `zc.buildout 2.3.1`.

- Update tests to only run with `py.test`.

- Update code and tests to changes in `icemac.addressbook 2.6`.