Fix the path to qunit.js and qunit.css

The submodule no longer provides qunit.js or qunit.css
So, directly accessing from the CDN
Remove prefixed border-radius rules
Merge pull request #340 from Nikerabbit/cssfix

Remove prefixed border-radius rules
Merge pull request #339 from kartikm/qunit-path-fix

Fix the path to qunit.js and qunit.css