Add test for CSS3 all

http://www.w3.org/TR/css3-cascade/#all-shorthand
Update tests.js

remove extra "
updated "all" property to newest version of spec

Currently in "last call" status now so it shouldn't change anymore.

http://www.w3.org/TR/2013/WD-css-cascade-3-20130730/#all
Merge pull request #42 from Christoph142/patch-1

Add test for CSS3 all