Support activities with dates in the Unix timestamp format
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Fixes #763 (closed)
Site https://juick.com sent activities with a published field in the "Unix timestamp with milliseconds" format (1553808404.602961) instead of ISO 8601. It caused an error in activity_view.ex.
They claimed that they had changed the date format in the Jackson library (JSON library for Java Spring framework) settings, but I still got this error for some their activities.