fix(orderBy): sort by identity if no predicate is given

Closes #5847
Closes #4579
Closes #9403
docs(angular.element): `css()` method does not retrieve computed styles

The jQuery css() getter functionality utilises getComputedStyle() whereas
jqLite only retrieves what is declared inline on an element.

Closes #7599
docs(guide/accessibility): Update documentation
fix($browser): handle async href on url change in <=IE9

Closes #9235