Use QUnit.log(...) instead of QUnit.log = ...

Refs http://qunitjs.com/upgrade-guide-2.x/#replace-qunit-log-callback-with-qunit-log-callback-for-all-reporting-callbacks

js/tests/index.html

@@ -43,12 +43,12 @@
 
       QUnit.testStart(function (testDetails) {
         $(window).scrollTop(0)
-        QUnit.log = function (details) {
+        QUnit.log(function (details) {
           if (!details.result) {
             details.name = testDetails.name
             log.push(details)
           }
-        }
+        })
       })
 
       // Cleanup