Upgraded jquery-ui-1.8.11.custom.min.js -> jquery-ui-1.8.13.custom.min.js

Changelog: http://jqueryui.com/docs/Changelog/1.8.13
The widget Autocomplete has always been excluded from our build out due to the fact we use another solution for autocomplete and don't want to risk any conflicts.
Note that I removed the widget Datepicker from our build out this round since we don't use it and it seems to always been the main source of bug fixes.