Integrate the pane containers into the workspace

src/panel.coffee

@@ -3,7 +3,7 @@
 # Public:
 module.exports =
 class Panel
-  constructor: ({@viewRegistry, @item, @orientation}) ->
+  constructor: ({@viewRegistry, @item}) ->
     @emitter = new Emitter
 
   destroy: ->
@@ -11,8 +11,6 @@ class Panel
 
   getView: -> @viewRegistry.getView(@item)
 
-  getOrientation: -> @orientation
-
   ###
   Section: Event Subscription
   ###