Fixes #14894

Take "olddisplay" value into the account

Fixes #14824
Closes gh-1566
Ref 73fe1729

* Use tabs instead of spaces in jscs config

* Always use spaces in package.json (really hope this is temporary)

Fixes #14901
Fixes #14793

According to http://www.w3.org/TR/CSS2/page.html#propdef-orphans, widows
and orphans can take only positive integer values. Together with a Chrome 34
regression this caused the test to fail.

Fixes #15016
Closes gh-1563

Fixes #14979
Closes gh-1560

Ref jquery/jquery-release#61
Fixes #15020
Closes gh-1561

* Update "grunt-jscs-checker" package

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

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

Remove needless empty line character

(cherry-picked from the 71780965072b1271018f2cf360e82fbe31f4987e)

Picked up so tests from the 1.x-master would be more similar to this branch

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

Conform to style guide and simplify it

Fixes #14818

We're not testing on IE6-7 anymore.

Closes gh-1544

Spec:
http://dom.spec.whatwg.org/#dom-element-matches

Support in Chromium:
https://code.google.com/p/chromium/issues/detail?id=326652

Fixes #14902
Closes gh-1524

Fixes #14897
Closes gh-1545