1.2:
   * Added TodayButtonDoesSelection property.
   * Added Version constant to the control.
   * Added ShowPopup method.

1.1:
   * Made Enabled property work.
   * Made Visible property work.
   * Changed how jQuery is loaded and changed how the Javascript
     part of the control is loaded. (Special thanks to Tim Parnell 
     for tips on how to get this under control)

1.0:
   * This is the first version