Ensure build tests pass the correct exit code when their time limit is hit.

Former-commit-id: ead1bcc0448a639d5310ceb63e2efcf81e64a0c3

.travis.yml

@@ -1,7 +1,7 @@
 language: node_js
 node_js:
   - 0.6
-  - 0.8
+  - 0.9
 git:
   depth: 1
 branches:

test/test-build.js

@@ -1214,7 +1214,9 @@
   /*--------------------------------------------------------------------------*/
 
   if (isFinite(timeLimit)) {
-    setTimeout(process.exit, timeLimit * 6e4);
+    setTimeout(function() {
+      process.exit(QUnit.config.stats.bad ? 1 : 0);
+    }, timeLimit * 6e4);
   }
   // explicitly call `QUnit.start()` for Narwhal, Node.js, Rhino, and RingoJS
   if (!global.document) {