[Seaside] Static resources location

[Kamil Kukura]

> An interesting trick that I was considering implementing for this is to 
> set the Content-Location header of any CSS files to point to a 
> configurable static base URL - this will then (I think) get used by the 
> web browser when evaluating relative URLs within the stylesheet, and so 
> you could keep your CSS clean of any interpolation like the above.

And this would work also for text/html content? I mean in case of <img> 
resources being used. Anyway, it sounds good.

-- 
Kamil