Chris Hill-Scott 84a2862387 Fix 500 being thrown when uploading large files ...

This is re-fixing a bug which was re-introduced when adding the
`Spreadsheet` class in 1409ca36ca.

It was previously fixed in 19662d8329:

>  Fix bug with large file uploads
>
>  Depending on the size of the uploaded file, Flask will temporarily store
>  it in different ways. This means that it comes back as a `TempFile` if
>  the file is roughly <500k and as `BytesIO` if the file is larger.
>
>  `TempFile` supports the `.getvalue()` method, but `BytesIO` does not.
>  Both support the `.read()` method, so this commit changes to use that
>  instead.

2016-07-07 11:52:57 +01:00

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