Widget: Make _addClass auto remove classes in destroy
Accordion: Implement new _addClass api
Dialog: Implement new _addClass api
Menu: Implement new _addClass api
Progressbar: Implement new _addClass api
Selectmenu: Implement new _addClass api
Slider: Implement new _addClass api
Spinner: Implement new _addClass api
Tabs: Implement new _addClass api
Tooltip: Implement _addClass
Menu: Update tests for classes option
Autocomplete: Implement new _addClass api