chore(karma): upgrade karma to 0.8.4

we needed this upgrade to disable animations in scenario runner
(karma ships with its own copy of angular-scenario.js which
got update in 0.8.4)

Author: IgorMinar

package.json

@@ -12,7 +12,7 @@
     "q-fs": "0.1.36",
     "qq": "0.3.5",
     "shelljs": "0.1.2",
-    "karma": "~0.8",
+    "karma": "0.8.4",
     "yaml-js": "0.0.5"
   }
 }