Fixed #575. The select all is not triggering the onChange anymore. Only the onSelectAll is triggered.

Fixed trigger onSelectAll when deselecting Select All to behave different when uncheked or deselect all options

You can now add a class option to a node of the data provider options and it will be appended to the list item.

You can now add a class option to a node of the data provider options and it will be appended to the list item.

Changing the value of a single select dropdown using 'select' method does not clear the previous values because, deselectAll method won't deselect radio button's selections. It handled only checkboxes. So removed the checkbox specific filter in jquery selector.

if checkbox is not visible selectAll/deselectAll does not work

Fixes mouseover text appearing blank for multiselects generated by dataprovider

Add a placeholder using data-placeholder attribute so we don't need to create an entire function if we want to add placeholders to multiple multiselects.