Widget: Stop setting ui-state-disabled and aria by default on setting disabled option.
Fixes #5973 - Resizable: disabled should not have the ui-state-disabled class or aria attribute aria-disabled
Fixes #5974 - Draggable: disabled should not have the ui-state-disabled class or aria attribute aria-disabled
Fixes #6039 - Droppable: disabled should not have ui-state-disabled

This reverts commit 23771d38ba9d2663f6db0243c8e992dc7ff6844a.
Sortable Tests: Add tests for axis option and recent axis option bugs.
Dialog: Removed deprecated position handling. Fixes #8825 - Dialog: Remove array and string notations for position option.
Accordion: Remove deprecated content property in create event. Fixes #8999 - Accordion: Remove content property from create event.
Datepicker: Don't use .zIndex(); implement the logic locally.
Core: Deprecated .zIndex(). Fixes #9061 - Core: Deprecate .zIndex().
Grunt: Don't run htmllint against core_deprecated.html.
Grunt: Add lint and test aliases.
Grunt: Run all CSS files through csslint.
Use .csslintrc instead of inlining rules in the Gruntfile.
Draggable: Fix double offset bug when scrolling. Fixes #6817 - Draggable: auto scroll goes double distance when dragging