use karma for javascript testing

package.json

@@ -34,6 +34,7 @@
     "eslint-plugin-filenames": "^1.1.0",
     "eslint-plugin-import": "^2.2.0",
     "eslint-plugin-jasmine": "^2.1.0",
-    "istanbul": "^0.4.5"
+    "istanbul": "^0.4.5",
+    "karma": "^1.3.0"
   }
 }