Add config.editor.invisibles field for customizing invisible glyphs.

src/app/editor.coffee

@@ -281,6 +281,10 @@ class Editor extends View
     @resetDisplay()
 
   setInvisibles: (@invisibles={}) ->
+    _.defaults @invisibles,
+      eol: '¬',
+      space: '•',
+      tab: '▸'
     @resetDisplay()
 
   checkoutHead: -> @getBuffer().checkoutHead()
@@ -299,6 +303,7 @@ class Editor extends View
 
   configure: ->
     @setShowInvisibles(config.editor.showInvisibles ? false)
+    @setInvisibles(config.editor.invisibles)
 
   handleEvents: ->
     config.on "update.editor#{@id}", => @configure()
@@ -393,7 +398,6 @@ class Editor extends View
     @calculateDimensions()
     @hiddenInput.width(@charWidth)
     @setSoftWrapColumn() if @activeEditSession.getSoftWrap()
-    @invisibles = @rootView()?.getInvisibles()
     $(window).on "resize.editor#{@id}", => @requestDisplayUpdate()
     @focus() if @isFocused
 

src/app/root-view.coffee

@@ -30,7 +30,6 @@ class RootView extends View
   extensions: null
   extensionStates: null
   fontSize: 20
-  invisibles: null
   title: null
 
   initialize: (pathToOpen, { @extensionStates, suppressOpen } = {}) ->
@@ -43,11 +42,6 @@ class RootView extends View
 
     TextMateTheme.activate(config.core.theme ? 'IR_Black')
 
-    @invisibles =
-      eol: '¬'
-      space: '•'
-      tab: '▸'
-
     @handleEvents()
 
     if pathToOpen
@@ -255,11 +249,5 @@ class RootView extends View
 
   getFontSize: -> @fontSize
 
-  setInvisibles: (invisibles={}) ->
-    _.extend(@invisibles, invisibles)
-    editor.setInvisibles(@invisibles) for editor in @getEditors()
-
-  getInvisibles: -> @invisibles
-
   saveAll: ->
     editor.save() for editor in @getEditors()