Range Selection mode

Range selection adds the capability to specify date ranges that are selectable.  All dates not in a range are disabled.  One click within a range, selects the entire range.

This is perfect for hotels or trip booking where there entire date range must be selected.

Overlapping ranges are handled by selecting the earliest date range in the overlapping section.

## HOW TO USE

![screen shot 2013-08-23 at 4 05 20 pm](https://f.cloud.github.com/assets/3653936/1019582/893095e0-0c48-11e3-8da9-d2b00aafbd58.png)