[css3-background] Tests for border-image

Hello everyone,

At Rebecca's request, I just push the tests I wrote during "Test The Web
Forward" in Paris.

Those test are available in the mercurial repo under:
contributors/jpatonni/submitted/css3-background/

I think they need to be reviewed, so who should I ask for such a review?

Best regard
-- 
Jeremie Patonnier
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Web : http://jeremie.patonnier.net
Twitter : @JeremiePat <http://twitter.com/JeremiePat>