* feat(core): node engine update, adding cleanup and reinstall npm scripts

Node engine updates and package.json additional scripts (#1567)
* updated cleanup with 'npm cache clean' as well

.eslintrc.js

@@ -51,6 +51,7 @@ module.exports = {
   },
   env: {
     node: true,
+    es6: true,
     browser: true,
     jasmine: true,
     mocha: true,

package.json

@@ -11,11 +11,13 @@
     "url": "https://github.com/meanjs/mean.git"
   },
   "engines": {
-    "node": ">=0.12.0",
-    "npm": ">=2.0.0"
+    "node": ">=4.6.0",
+    "npm": ">=3.10.8"
   },
   "scripts": {
     "update": "npm update && npm prune && bower install --allow-root && bower prune --allow-root",
+    "clean": "rm -rf node_modules/ public/lib/",
+    "reinstall": "npm cache clean && npm run clean && npm install",
     "start": "gulp",
     "start:prod": "gulp prod",
     "start:debug": "node-debug --web-host 0.0.0.0 server.js & gulp debug",