Fixing extra comma.
Cause errors to be raise outside the TimingTest loop.
Sometime a test is finished before it has LOADED.
Merge pull request #429 from mithro/comma

Fixing extra comma.
Fallback to non-mirrors version if the mirrors version fails.
Merge pull request #432 from mithro/pip-fix

Fallback to non-mirrors version if the mirrors version fails.
Merge pull request #431 from mithro/state-fix

Sometime a test is finished before it has LOADED.
Testing and fixing support for shadow CSS value parsing.
Merge pull request #427 from mithro/fixing-css-shadow-support

Testing and fixing support for shadow CSS value parsing.
s/"/'/g to be consistent with rest of web-animations.
Merge pull request #430 from mithro/error-raising

Cause errors to be raise outside the TimingTest loop to avoid timing out the whole page.
Merge pull request #433 from mithro/double2single

s/"/'/g to be consistent with rest of web-animations.