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

package.json

@@ -35,7 +35,7 @@
     "jscs": "2.11.0",
     "jshint": "2.9.1",
     "karma": "0.13.22",
-    "karma-chrome-launcher": "1.0.1",
+    "karma-chrome-launcher": "2.2.0",
     "karma-cli": "1.0.0",
     "karma-firefox-launcher": "~0.1",
     "karma-qunit": "1.0.0",