Added a DateFormat to the styles. It does the same function as Style.NumberFormat but it will be more intuitive for someone trying to format a date.
Added "IXLRanges Ranges(...)" methods to the IXLRange interface. IXLRanges is a collection of ranges which allow you to modify them all in one shot.
Worksheet.Style, Worksheet.Columns(), and Worksheet.Rows() now apply to the entire worksheet (not just the used cells).