refactor traffic report

split traffic report in 2, page view vs raw traffic
hide raw traffic report by default
improve flushing logic for application reqs

app/assets/javascripts/admin/controllers/admin-dashboard.js.es6

@@ -53,6 +53,9 @@ export default Ember.Controller.extend({
   actions: {
     refreshProblems: function() {
       this.loadProblems();
+    },
+    showTrafficReport: function() {
+      this.set("showTrafficReport", true);
     }
   }