Scelvis

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- improved cache handling
- improved user feedback for filtering & differential expression

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- added conversion from .loom files
- cell filtering also supports downsampling
- added PBMC dataset hosted on figshare
- added demo movie

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- cell filtering
- differential expression

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- upgrades to Dash v1
- fixes to UI, upload and conversion
- avoid creation of dense matrices

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- Fixing bug with specifying single ``.h5ad`` file as data source.
- Adding ``Dockerfile`` for building Docker images from intermediate versions.

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- Adding support for HTTP(S) data sources.
- Embedding ``about.md`` information in Anndata file.
- Adding support for passing

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