Updating engine.io version in kaefer too

node_modules/kaefer/package.json

@@ -8,8 +8,8 @@
         "email": "fabian@c9.io"
     }],
     "dependencies": {
-        "engine.io": "~1.3.1",
-        "engine.io-client": "~1.3.1",
+        "engine.io": "~1.5.1",
+        "engine.io-client": "~1.5.1",
         "amd-loader": "*"
     },
     "devDependencies": {