widgetMenu, add with index and set
Remove root element from page treeview

*merging Edit /add menu from root element to page
*rename edit -> rename for pages
+ Add "New" button in pageEditor toolbar, extracted from root Element's
add menu
Merge branch 'master' of github.com:Heigvd/Wegas

# By Anthony Geiser
# Via Anthony Geiser
* 'master' of github.com:Heigvd/Wegas:
  Bigger label when it's empty
  Transition toolbox appears on label mouseover
  Replace private size attribute (_node.clientWidth) by public attribute (region.width)
  Refactor save function