first revision of sundial

Works with current uploader code, not yet modified to include needed tideline functions.

@jh-bate or @cheddar please review. @cheddar would like me to merge and tag this and have the uploader depend on it before merging the uploader branch where I've removed the moment dependency and replaced it with sundial methods.
I'm not sure what this test is testing.  From the name `utcDateString()` I would expect the zone to always be UTC, but this test seems to indicate that such is not the case?