update to the default bugzilla css

[byron]

> I'm ambivalent about the body background, which is virtually invisible, 
> and the use of a background image for the header, whose advantages over 
> styled text and structure seem too slight to be worth it.

it's a skin -- i wanted to do the changes without any template modifications.

> Otherwise I'm happy to see these changes get integrated into Bugzilla.  
> Please file bugs in the UI component and request my review.  Note that 
> in general smaller, focused patches are easier to review and quicker to 
> integrate than larger patches that do many things at once, so consider 
> breaking your changes up into separate patches for each change or 
> related set of changes.

the patch is small, only affects global.css and index.css plus the new files.

bug 279896



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