Selectmenu Tests: add unit tests for empty options
Menu: Add _isDivider method

Ability to prevent generation of dividers from items

Fixes #9701
Selectmenu: Fix empty option processing

Ref #9701
Selectmenu: fix lint issue
Tooltip: Improve accessibility by adding content to an aria-live div

Fixes #9610
Closes gh-1118
Tooltip: On close and destroy only set title if empty or undefined

Ticket #8925 states that changes to the title attribute while the
tooltip is open are lost on tooltip close.

In the close and destroy functions, the title attribute is always
written if a value was stored in the element on open. It is possible
the attribute has changed and restoring the initial value may overwrite
the current value.

If the value is empty or undefined as set in open, do not set the title
attribute.

This fix has the limitation that if the user removed the title
attribute or set the value to an empty string the original title value
would be restored on close and destroy.

Fixes #8925
Tooltip: Lowercase test html for IE7/8 compat
Tests: Add link to visual test for selectmenu to index
Tests: Fix grammar error in comment

Changed it's to its.

Closes gh-1164
Menu: Fix var declaration and move regex comment to the right place.

Follow-up to a6806ab1
Tooltip: Only bind remove handler for delegated tooltips

The remove handler was being added for every tooltip, but only removed for
delegated tooltips. The default destroy behavior already handles non-delegated
tooltips, so the handler should only be added for delegated tooltips.

Fixes #9531
Closes gh-1156
Docs: Reduce contributing guidelines by linking to contribute.jquery.org

Closes gh-1161
Resizable: whitespace fixed

Closes gh-1162
Tooltip: Preserve the title after disabling twice

Fixes #9719
Closes gh-1154
Build: Update grunt and grunt-jscs-checker, use jquery preset for jscs
Datepicker: Fix Spanish locale data

Fixes #9735
Closes gh-1166
Autocomplete: Announce autocomplete correctly in all ATs.

Fixes #9631
Closes gh-1153
Sortable: Cleanup

Closes gh-1168
Closes gh-1169
Dialog: Apply `overflow: hidden` to contain the resize handles

Fixes #9521
Closes gh-1092
Resizable: Only resize/reposition if size is greater than specified grid

Fixes #9611
Closes gh-1132