Flotils

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* Update supported versions

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* pyyaml FullLoader
* load/save bug fixes

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* Fix json loading bug
* Make json time loading more permissable

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* Fix typos
* Flake8 not version bound
* Update pyyaml
* Remove deprecated code
* Fix open() calls (use io.open(), no byte open, utf8 encoding)
* StartStopable.is_running
* DateTimeEn/Decode free of time zone (always utc)
* Drop "python-dateutil" dependency
* Basic loadable test file

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* missing merge

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* small __init__ changes