#2753 - status_tag supports boolean status (fix)

Hi guys,

I fixed this issue little bit. Previous version didn't worked for me. It had been accepting only boolean value in a string which I think made no sense.
> status_tag HTML classes are also generated from status string by status_to_class (which I personally think is not very clear solution)

Yes, that right, but it make it much more handy.

I think we can merge this (I mean the css for the moment, the rest will show the discussion).