disableOuterDates is optional
disableOuterDates is optional

I assume this is correct. Docs are a bit unclear about default value, but I tracked the usage [to here](https://github.com/mlaursen/react-md/blob/master/src/js/Pickers/CalendarMonth.js#L129) and looks like it is `false` (since `undefined` will be falsy).
mlaursen/react-md,mlaursen/react-md,mlaursen/react-md