Fix tests for existing elements

The type of a just created HTMLElement is never undefined, it is
actually an object of type HTMLUnknownElement. So now instead of
comparing to undefined, the tests check if the element is an instance of
HTMLUnknownElement and fails if it is.
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Merge pull request #311 from lucianafujii/version-5.0

Fix tests for existing elements
Fix sidebar on systems without transforms
Add Xbox, Windows Phone and Android < 2.2 on the form.file blacklist
Allow cross domain requests of the fonts
Merge branch 'version-5.0' of https://github.com/NielsLeenheer/html5test into version-5.0
Only record scores from version 5 and up
Store a testsuite revision
Fix a bug which caused blocked features to still get points
Add a test for JPEG-XR export
Update copyright date