Mopidy-somafm

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- 3: Correct wrong subclassing

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- Require Mopidy >= 0.18
- Add proxy support for downloading SomaFM content
- 1: handle 'requests' exceptions
- Use builtin Mopidy's .pls support
- Internal code cleanup

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- PLS files are downloaded to local temp directory
- Implement library::lookup to allow adding tracks from playlist uri

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- Update Licence information

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- Initial release
- Create SomaFM extension for Mopidy