New tests for css3 counter styles

This set of tests is exported to flat files from the i18n test framework. To see the tests and results in that framework see http://www.w3.org/International/tests/html5/css3-counter-styles/results-cstyles

I have submitted these as manual tests rather than reftests, because I don't know how to replicate the auto-numbered part of the list to pixel-perfection.  (If someone can tell me how to do that, and has checked that it really works, I'd be willing to update the tests to full reftest.  Note, that these tests use a wide range of unicode characters, of necessity, so ahem and even downloadable fonts are not very helpful afaict.)