Edited Issue: Ability to add a class attribue to a WebGrid column header [854]

Hi!

I am currently using the WebGrid and trying to do some styling to special colums. I can use the "Style" Property if the WebGridRow for this, but there is no way to style the header too. It would be pretty usefull if the class definined for the Column would also be added to the header (Or to prevent breaking changes, add a new property).