Allow Customization of relativeTime Display (i.e. always show in days)

[lazyshamrock]

I'd like to be able to control how the relative time is displayed. For example, I'd like to be able always show a countdown in number of days rather than converting to months for further out dates. Once the countdown is below the selected relative time selection (e.g., relativeTime display is set to "day". Once the time till the event is less than a day, start displaying in hours.)