Updated the Calendar sample with a liquid layout.

This update includes:

- **A fix for**: some issues with IE when loading the calendar, and also issues with the calendar header section in multiple browsers.  These issues arise when using [version 1.4.10+ of Aria Templates](https://github.com/ariatemplates/ariatemplates/compare/v1.4.9...v1.4.10 "commits breaking the calendar"), as a result the calendar is currently supported by Aria Templates version 1.4.9

- **A liquid layout** for the calendar sample, now the sample supports multiple screen resolutions