Updating engine.io to latest version to address security issue

node_modules/kaefer/package.json

@@ -8,8 +8,8 @@
         "email": "fabian@c9.io"
     }],
     "dependencies": {
-        "engine.io": "~1.5.1",
-        "engine.io-client": "~1.5.1",
+        "engine.io": "~1.6.9",
+        "engine.io-client": "~1.6.9",
         "amd-loader": "*"
     },
     "devDependencies": {

package.json

@@ -17,8 +17,8 @@
         "debug": "~0.7.4",
         "ejs": "~1.0.0",
         "emmet": "git://github.com/cloud9ide/emmet-core.git#2ff6dc06ad",
-        "engine.io": "1.5.3",
-        "engine.io-client": "1.5.3",
+        "engine.io": "^1.6.9",
+        "engine.io-client": "^1.6.9",
         "jsonm": "1.0.6",
         "http-error": "~0.0.5",
         "less": "^2.4.0",