Revert "Revert "Dogfood the new jasmine-npm completion interface""

This reverts commit 4c043717a9.

Gruntfile.js

@@ -40,11 +40,17 @@ module.exports = function(grunt) {
           jasmine = new Jasmine({jasmineCore: jasmineCore});
 
       jasmine.loadConfigFile('./spec/support/jasmine.json');
-      jasmine.onComplete(function(passed) {
-        done(passed);
-      });
 
-      jasmine.execute();
+      jasmine.exitOnCompletion = false;
+      jasmine.execute().then(
+        result => {
+          done(result.overallStatus === 'passed');
+        },
+        err => {
+          console.error(err);
+          exit(1);
+        }
+      );
     }
   );
 

package.json

@@ -44,7 +44,7 @@
     "grunt-contrib-concat": "^1.0.1",
     "grunt-css-url-embed": "^1.11.1",
     "grunt-sass": "^3.0.2",
-    "jasmine": "^3.4.0",
+    "jasmine": "^3.10.0",
     "jasmine-browser-runner": "github:jasmine/jasmine-browser#main",
     "jsdom": "^15.0.0",
     "load-grunt-tasks": "^4.0.0",