Correctly report spec and suite duration

Previously, suite duration was always reported as 0 and spec duration
was always reported as null. Suites always used a no-op timer, and
specs set their result.duration after the result had already been sent
to reporters.

Fixes #1676.

src/core/Suite.js

@@ -14,7 +14,7 @@ getJasmineRequireObj().Suite = function(j$) {
     this.beforeAllFns = [];
     this.afterAllFns = [];
 
-    this.timer = attrs.timer || j$.noopTimer;
+    this.timer = attrs.timer || new j$.Timer();
 
     this.children = [];