page treeview

now waits for a page event before rendering
*bug fixes
+pageloader "contentUpdated" event
Merge branch 'master' of github.com:Heigvd/Wegas

# By Francois-Xavier Aeberhard
# Via Francois-Xavier Aeberhard
* 'master' of github.com:Heigvd/Wegas:
  Fix Y.Wegas.TabView.destructor