emitting selection-change event to be conform to what the Selection
mixin is doing.
rename _onEvent methods to _eventHandler
remove _observerHandle and declaration of _selectionClickHandle, and
remove the destroy method.
multiple fixes following Patrick Ruzand's review of the code.
mutualize more code in the ItemRenderer._renderNode method.
Custom renderer do not extends the base class anymore, but extends the
default renderer class itself.
redefining delite/Store.initItems instead of listening to the
query-success event.
Redefining delite/Store removeItem, addItem and putItem methods instead
of defining custom handlers for the List.
list/ScrollableList does not exists anymore. List uses delite/Scrollable
instead.
Using delite/Scrollable instead of deliteful/list/ScrollableList
List now supports RTL.