Kotti-media

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- Bugfix: respect permissions when iterating over children in
media_folder_view

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- Fix documentation.

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- Rename package to kotti_media (was: kotti_video).
- Add tests (100% coverage from now on).
- Add audio support.
- Add external URL support for CDN storage / delivery of file data.
- Add ``media_folder_view`` for context ``kotti.resources.Document``.

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- Release for Kotti >= 0.7dev.

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- Initial release.