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BUG/ENH: Error handling in tabulate / loading bar (#22)

Fixes #21 by adding more robust error handling when parsing JSON that
represents the merged and normalized metadata. The client-side exporting
has been removed and replaced with a call to `Metadata.save`, which
handles all kinds of edge cases and normalization on our behalf. This
exported TSV link is always visible in the viz, that way if the
interactive table rendering fails, a user can still get a copy of the
merged and normalized metadata.

Addresses #19 by adding in a simple progress indicator, as well as
linking that indicator to the loading status and error handling. Note,
there isn't any meaningful representation of loading progress at this
point, just a binary "loading" / "not loading" type of indicator.

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