(cherry-picked from d0131da7)

* Update "grunt-jscs-checker" package

* Use ".jscsrc" file instead of old ".jscs.json"

* Use jquery preset instead of explicitly defining all the jscs rules

(Cherry-picked from b7283d73 commit)

Since global variable for callback always would be equal to undefined value
it better to check for boolean instead

Also fix issues found by jscs

Conflicts:
	test/data/testrunner.js

Fixes #14818

Conflicts:
	test/data/testrunner.js

Conflicts:
	test/data/testrunner.js

We're not testing on IE6-7 anymore.

(cherry-picked from a0568b07)

(cherry-picked from 7869891a)

(cherry-picked from 99d735ab)

Ref 80cf965e
Ref #14848

Closes gh-1544
(cherry picked from commit 5265cdac)

Change boxSizingReliable test value to false in all IE versions.
Modify support comments to argument getComputedStyle guards
with oldIE support and not node.js which is not supported in 1.x.

Closes gh-1498

Android 2.3 is happy with returnValue already used for oldIE;
the getPreventDefault() fallback is not needed.

Closes gh-1546

Fixes #14848
Closes gh-1548
(cherry picked from commit 890d441a)

Conflicts:
	src/effects.js

Fixes #14750
Closes gh-1509
(cherry picked from commit 5a8f7693)

Conflicts:
	src/css.js

Fixes #14858
Ref #14686
Closes gh-1531

Fixes #14736
Closes gh-1501
(cherry picked from commit 51910ba8a5aff4cd1a811f1fdb76a6c62a09a666)

Closes gh-1547
(cherry picked from commit ca0086b5)

Closes gh-1551
(cherry picked from commit 9ad6e7e9)

Conflicts:
	speed/event.html
	speed/slice.vs.concat.html

Closes gh-1523
(cherry picked from commit 176a2913260b4ec890118137ccc9a290064a59be)

Conflicts:
	package.json

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.

(cherry-picked from a10aa3aa)

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.

(cherry-picked from b5074944)

(cherry-picked from c1e9bb9e)

(cherry-picked from 551578eb)

Fixes #14882

Fixes #14741
Closes gh-1503
(cherry picked from commit 472f70a9)