Update campaign editor analytics

Color in level name based on number of users remaining.

app/styles/editor/campaign/campaign-analytics-modal.sass

@@ -1,3 +1,12 @@
 #campaign-analytics-modal
   .modal-dialog
     width: 75%
+  .level-name-container
+    position: relative
+    .level-name-background
+      position: absolute
+      height: 100%
+      left: 0px
+      top: 0px
+      background-color: green
+      opacity: 0.25

app/templates/editor/campaign/campaign-analytics-modal.jade

@@ -24,7 +24,8 @@ block modal-body-content
       tbody
         - for (var i = 0; i < campaignCompletions.levels.length; i++)
           tr
-            td= campaignCompletions.levels[i].level
+            td.level-name-container= campaignCompletions.levels[i].level
+              span.level-name-background(style="width:#{campaignCompletions.levels[i].usersRemaining || 0}%;")
             td= campaignCompletions.levels[i].started
             td= campaignCompletions.levels[i].finished
             td= campaignCompletions.levels[i].dropped

app/views/editor/campaign/CampaignAnalyticsModal.coffee

@@ -101,8 +101,10 @@ module.exports = class CampaignAnalyticsModal extends ModalView
     success = (data) =>
       return if @destroyed
       # console.log 'getCampaignLevelCompletions success', data
+      maxStarted = if data.length > 0 then (_.max data, ((a) -> a.started)).started else 0
       mapFn = (item) ->
         item.completionRate = if item.started > 0 then (item.finished / item.started * 100).toFixed(2) else 0.0
+        item.usersRemaining = Math.round(item.started / maxStarted * 100.0) unless maxStarted is 0
         item
       @campaignCompletions.levels = _.map data, mapFn, @