Ended test fro navigation in treeview.

For now I check that contain a url and link is defined. I tried to check transitionTo or handleEvent inj Link with jest but doesn't work.
Refactored treeview and treenode.

I have created a config treeview called node in treeview. This config knows
how ask for data and how map to treenode this data.

Now we have to think in what we are going to do with this config.