SelectAll will now only trigger "onSelectAll", as opposed to additionally trigger "onItemSelect" for every items in the list
DeselectAll will now only trigger "onDeselectAll", as opposed to additionally trigger "onItemDeselect" for every items in the list
Fixed: "onSelectAll" was incorrectly called when clicking "Uncheck All" due to bad boolean comparison
Added: "Handling Events" section in the demo page