Improve CampaignEditor saving, particularly level order

* Do not cache campaign
* Instead have an on leave message if there are unsaved changes
* Propagate campaignIndex values to campaign and levels so that they signal a change in order

 The save modal seems to have a lot of issues with identifying what models have
 changed. I tried using different methods, but none were consistent. Moving on
 to other bugs.

app/models/Campaign.coffee

@@ -8,7 +8,6 @@ module.exports = class Campaign extends CocoModel
   @className: 'Campaign'
   @schema: schema
   urlRoot: '/db/campaign'
-  saveBackups: true
   @denormalizedLevelProperties: _.keys(_.omit(schema.properties.levels.additionalProperties.properties, ['unlocks', 'position', 'rewards']))
   @denormalizedCampaignProperties: ['name', 'i18n', 'slug']
   

app/views/editor/campaign/CampaignEditorView.coffee

@@ -60,6 +60,14 @@ module.exports = class CampaignEditorView extends RootView
     @listenToOnce @levels, 'sync', @onFundamentalLoaded
     @listenToOnce @achievements, 'sync', @onFundamentalLoaded
 
+  onLeaveMessage: ->
+    @propagateCampaignIndexes()
+    for model in @toSave.models
+      diff = model.getDelta()
+      if _.size(diff)
+        console.log 'model, diff', model, diff
+        return 'You have changes!'
+
   loadThangTypeNames: ->
     # Load the names of the ThangTypes that this level's Treema nodes might want to display.
     originals = []
@@ -144,6 +152,19 @@ module.exports = class CampaignEditorView extends RootView
 
     super()
     
+  propagateCampaignIndexes: ->
+    campaignLevels = $.extend({}, @campaign.get('levels'))
+    
+    index = 0
+    for levelOriginal, campaignLevel of campaignLevels
+      level = @levels.findWhere({original: levelOriginal})
+      if level.get('campaignIndex') isnt index
+        level.set('campaignIndex', index)
+      campaignLevel.campaignIndex = index
+      index += 1
+
+    @campaign.set('levels', campaignLevels)
+
   onClickPatches: (e) ->
     @patchesView = @insertSubView(new PatchesView(@campaign), @$el.find('.patches-view'))
     @patchesView.load()
@@ -160,6 +181,7 @@ module.exports = class CampaignEditorView extends RootView
           break
 
   onClickSaveButton: ->
+    @propagateCampaignIndexes()
     @toSave.set @toSave.filter (m) -> m.hasLocalChanges()
     @openModalView new SaveCampaignModal({}, @toSave)
 

app/views/play/CampaignView.coffee

@@ -80,7 +80,6 @@ module.exports = class CampaignView extends RootView
         return
 
     @campaign = new Campaign({_id:@terrain})
-    @campaign.saveBackups = @editorMode
     @campaign = @supermodel.loadModel(@campaign).model
 
     # Temporary attempt to make sure all earned rewards are accounted for. Figure out a better solution...