Mopidy-local-images

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- Require Mopidy v1.1 or later.

- Use ``Extension.get_data_dir()`` as default image directory.

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- Remove `.coveragerc`.

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- Update ``local.translator`` imports for Mopidy v1.1.

- Update build/test environment.

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- Fix width/height for JPEG images.

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- Extract image dimensions.

- Support aggressive browser caching.

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- Support local library methods added with Mopidy v0.20.

- Avoid scanning each track twice by using the tags passed to
``Library.add`` with Mopidy v0.20.