Jmbo-music

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. Refactor credit options to work in a multilingual environment. Existing credit options will be lost but at worst existing UI will have a blank space.
. Track feed management command framework created. Includes a demo track feed `track_feed_example`.
. Pull artist, track and album info from Wikipedia.

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. Friendlier urls to detail pages.

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. Rename `get_primary_contributers` method to be `primary_contributors_permitted` property to adhere to Jmbo convention.

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. Introduce a dependency on `jmbo-gallery`, thus implicitly on `jmbo-foundry`.

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. Better packaging.