Add Project.getState() and make Project.serialize clone state

spec/app/project-replication-spec.coffee

@@ -11,7 +11,7 @@ describe "Project replication", ->
     project1.bufferForPath('a')
     expect(project1.getBuffers().length).toBe 1
 
-    doc1 = project1.serialize()
+    doc1 = project1.getState()
     doc2 = doc1.clone(createSite(2))
     doc1.connect(doc2)
 

src/app/project.coffee

@@ -71,8 +71,8 @@ class Project
       for insertedBuffer, i in inserted
         @addBufferAtIndex(deserialize(insertedBuffer), index + i, updateState: false)
 
-  serialize: ->
-    @state
+  serialize: -> @state.clone()
+  getState: -> @state
 
   # Retrieves the project path.
   #

src/app/window.coffee

@@ -123,7 +123,7 @@ window.deserializeEditorWindow = ->
   window.project = deserialize(windowState.get('project'))
   unless window.project?
     window.project = new Project(atom.getLoadSettings().initialPath)
-    windowState.set('project', window.project.serialize())
+    windowState.set('project', window.project.getState())
 
   window.rootView = deserialize(windowState.get('rootView'))
   unless window.rootView?