Tests for nav-left/-right/-up/-down CSS 3 UI properties
Merge pull request #372 from therealglazou/therealglazou/css3-ui-nav

[merge] Tests for nav-left/-right/-up/-down CSS 3 UI properties

The CSS test repo has recently undergone a big reorganization. We're taking care of all of the open PRs created previously from the old directory structure, merging them in as unreviewed, moving them to the correct new locations, and marking them unreviewed in Shepherd. Full details of this are explained here:

http://lists.w3.org/Archives/Public/public-css-testsuite/2014Jun/0023.html.