Move saveAll and specs to PaneContainer

And simplify the specs… we don't *really* need to save. We can just
ensure that save is called on everything.

src/app/pane-container.coffee

@@ -36,6 +36,9 @@ class PaneContainer extends View
   getRoot: ->
     @children().first().view()
 
+  saveAll: ->
+    pane.saveItems() for pane in @getPanes()
+
   getPanes: ->
     @find('.pane').views()
 

src/app/root-view.coffee

@@ -148,7 +148,7 @@ class RootView extends View
     super
 
   saveAll: ->
-    pane.saveItems() for pane in @getPanes()
+    @panes.saveAll()
 
   eachPane: (callback) ->
     @panes.eachPane(callback)