API Rename: QuantitiveScale -> QuantitativeScale

You know what's awkward? Having your base QuantitativeScale class be named "QuantitiveScale" rather than "QuantitativeScale". You know what's also awkward? The minor API break when you fix the spelling. This release does nothing but rename QuantitiveScale to QuantitativeScale. Since this is an abstract class, it should only affect Typescript consumers who were using it as a type signature for generic scales. It will not affect Javascript consumers of the API at all.