Add WorkspaceView and atom.workspaceView shims

exports/atom.coffee

@@ -22,6 +22,7 @@ unless process.env.ATOM_SHELL_INTERNAL_RUN_AS_NODE
   module.exports.$$$ = $$$
   module.exports.Editor = require '../src/editor-view'
   module.exports.RootView = require '../src/root-view'
+  module.exports.WorkspaceView = require '../src/root-view'
   module.exports.SelectList = require '../src/select-list'
   module.exports.ScrollView = require '../src/scroll-view'
   module.exports.Task = require '../src/task'

src/atom.coffee

@@ -43,6 +43,11 @@ class Atom
     @rootViewParentSelector = 'body'
     @deserializers = new DeserializerManager()
 
+    #TODO Remove once all `atom.rootView` references have been updated
+    Object.defineProperty this, 'workspaceView',
+      get: -> @rootView
+      set: (workspaceView) -> @rootView = workspaceView
+
   # Private: Initialize all the properties in this object.
   initialize: ->
     @unsubscribe()