Half a minute is more than enough for the test to finish even in the slowest
browsers and in case of starving the PHP FPM process pool, one has to wait
for only half a minute to try again.

Android 2.3 doesn't support stopImmediatePropagation; jQuery fallbacks
to stopPropagation in such a case.

PHP sleep function accepts time in seconds, not milliseconds; the previous
value was starving the PHP FPM process pool.

Fixes #14882

Fixes #14741
Closes gh-1503

Ref #14741
Ref gh-1503

Fixes gh-1540

Add a possibility to specify the project name. Infer browserSets & timeout
out of it instead of defining it in the Jenkins configuration.

Fixes #14888
Closes gh-1536

updates QUnit reference site and method naming.

Closes gh-1493

Fixes #14687
Closes gh-1478

The "document ready when jQuery loaded asynchronously" test fails all the time
in iOS7 and sometimes in other browsers. Bumping the timeouts *might* help
these other browsers to be less flakey here.

Fixes #13997

It's not easy to find a CSS property that is implemented even in
ancient browsers and that returns a consistent result among browsers
when passed through .css(). color didn't work since Firefox normalizes
it an empty value to rgb(0, 0, 0).

The workaround to be able to change !important styles broke the browser
keeping the old CSS value if the new one was rejected. Patching it would
involve a significant perf hit (~33%) so the initial patch needs to be
reverted instead.

Tests by m_gol & gibson042.

Fixes #14836
Closes gh-1532

Fixes #14659

Fixes #14859

Fixes #14802

Fixes #14792

Fixes #14791

Fixes #14773

Fixes #14179

Fixes #14794

Ref #14798
Ref gh-1516
Ref gh-1338

Fixes #14798
Close gh-1516
Ref gh-1338

Ref a7ea12a9

Fixes #14785
Ref #13754
Ref badcd1b6

Similarly to iOS, Android 2.3 has the onbeforeunload property on window
but doesn't support the event. This commit blacklists the test there as well.