Add tests for CSS test-align-last property

Currently, Firefox supports -moz-text-align-last.
Merge pull request #388 from shiytan/shiytan/text-align-last

[merge] Add tests for CSS test-align-last property

Hi,

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, our test management system. Full details of this are explained here:

http://lists.w3.org/Archives/Public/public-css-testsuite/2014Jun/0023.html.

Once this is merged, you can see always see the status of your test contributions in Shepherd, where you can perform a detailed search here:
http://test.csswg.org/shepherd/search/

Thanks for your contribution!

-Rebecca