fixed unittest reference

tests/unittests.html

@@ -22,7 +22,7 @@
         mocha.setup('bdd');
         mocha.checkLeaks();
     </script>
-    <script src="./tests/timelineTests.js"></script>
+    <script src="./timelineTests.js"></script>
     <script class="mocha-exec">
         mocha.run();
     </script>