fix css matrix tests.

Change WebKitCSSMatrix rotate to rotateAxisAngle.
On iPhone 4 and iPhone 2 rotate produces wrong matrices.

Signed-off-by: Jan Sutter <jan.sutter@dfki.de>
fix video test.

Video test now first uses an mp4 file and only in the case of an error retries with an ogv file.
Test fails only in case both files cannot be loaded.

Signed-off-by: Jan Sutter <jan.sutter@dfki.de>