Add days-after helper

Currently, shuttlebot doesn't take the number of days before the booking into
consideration, apart from not changing bookings on today's date.

To help with fixing this, add days-after Given a base date and number of days,
it will produce a consecutive list of days. Then, when searching for available
bookings, we can use this list to ask "is the date I'm booking for in the list
of days-after?"

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