ItemRenderer have replaced SpaceTreeRenderer
## OrgChart.java
- the modifier of setSelectedNode() change public to private
- the TreeDataEvent.SELECTION_CHANGED can be triggered now

## OrgChart.js
- in $define, selectedNode and addNodeJson is null now

## SpaceTreeComposer
- comp.setSelectedNode replaced by model.addToSelction()
- rewrite comp.setItemRenderer()