Fix issue for the selection
Change content of the details property of SceneNodeSelected Event

Dispatch the glTFElement related to the SceneTreeNode which has been
selected instead of its name.
Css improvements for the SceneTreeView
Fix css issue
Use the selection provided by the repetition for the node selection
Merge pull request #6 from thibaultzanini/Improvements-Scene-Tree

Improvements for the SceneTreeView