chore(package): use latest node 4

Author: Awk34

templates/app/_package.json

@@ -183,8 +183,8 @@
     "typings": "^0.8.1"<% } %>
   },
   "engines": {
-    "node": "^4.4.0",
-    "npm": "^2.14.20"
+    "node": "^4.4.6",
+    "npm": "^2.15.5"
   },
   "scripts": {
     "test": "gulp test",