impressConsole broke init() if root element didn't have id="impress"

Also adds regression tests to prevent this from happening in the future
as well as upgrades karma-chrome-launcher to newest version.

Fixes #654

qunit_test_runner.html

@@ -19,6 +19,7 @@
   <script src="test/helpers.js"></script>
   <!-- Core tests -->
   <script src="test/core_tests.js"></script>
+  <script src="test/non_default.js"></script>
   <!-- Plugins -->
   <script src="src/plugins/navigation/navigation_tests.js"></script>