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
Droppable demos: Use ui-state-default for activation

Closes gh-1085
Position: Avoid reading overflow css on documents

Fixes #9533
Closes gh-1072