Improve slow level loading on CampaignView

* Fix LevelSetupManager to call onLevelSync asynchronously if level is not loaded on init
* Show a progress bar in level-info-container while level is loading asynchronously

app/lib/LevelSetupManager.coffee

@@ -26,12 +26,13 @@ module.exports = class LevelSetupManager extends CocoClass
     levelURL = "/db/level/#{@options.levelID}"
     @level = new Level().setURL levelURL
     @level = @supermodel.loadModel(@level, 'level').model
-    onLevelSync = ->
-      return if @destroyed
-      if @waitingToLoadModals
-        @waitingToLoadModals = false
-        @loadModals()
-    onLevelSync.call @ if @level.loaded
+    if @level.loaded then @onLevelSync() else @listenToOnce @level, 'sync', @onLevelSync
+
+  onLevelSync: ->
+    return if @destroyed
+    if @waitingToLoadModals
+      @waitingToLoadModals = false
+      @loadModals()
 
   loadSession: ->
     sessionURL = "/db/level/#{@options.levelID}/session"
@@ -104,6 +105,7 @@ module.exports = class LevelSetupManager extends CocoClass
     lastHeroesPurchased = me.get('purchased')?.heroes ? []
 
     @options.parent.openModalView(firstModal)
+    @trigger 'open'
     #    @inventoryModal.onShown() # replace?
 
   #- Modal events

app/templates/play/campaign-view.jade

@@ -28,6 +28,8 @@ if campaign
         div(style="left: #{level.position.x}%; bottom: #{level.position.y}%", class="level-shadow" + (level.next ? " next" : "") + " " + (levelStatusMap[level.slug] || ""))
         .level-info-container(data-level-slug=level.slug, data-level-path=level.levelPath || 'level', data-level-name=level.name)
           - var playCount = levelPlayCountMap[level.slug]
+          .progress.progress-striped.active.hide
+            .progress-bar(style="width: 100%")
           div(class="level-info " + (levelStatusMap[level.slug] || "") + (level.requiresSubscription ? " premium" : ""))
             .level-status
             h3= i18n(level, 'name') + (level.disabled ? " (Coming soon!)" : (level.locked ? " (Locked)" : ""))

app/views/play/CampaignView.coffee

@@ -499,8 +499,11 @@ module.exports = class CampaignView extends RootView
     levelSlug = levelElement.data 'level-slug'
     session = @preloadedSession if @preloadedSession?.loaded and @preloadedSession.levelSlug is levelSlug
     @setupManager = new LevelSetupManager supermodel: @supermodel, levelID: levelSlug, levelPath: levelElement.data('level-path'), levelName: levelElement.data('level-name'), hadEverChosenHero: @hadEverChosenHero, parent: @, session: session
+    @$levelInfo.find('.level-info, .progress').toggleClass('hide')
+    @listenToOnce @setupManager, 'open', ->
+      @$levelInfo.find('.level-info, .progress').toggleClass('hide')
+      @$levelInfo?.hide()
     @setupManager.open()
-    @$levelInfo?.hide()
 
   onClickViewSolutions: (e) ->
     levelElement = $(e.target).parents('.level-info-container')