Change CSP config format to be more intuitive

lib/config/default.js

@@ -15,17 +15,9 @@ module.exports = {
   },
   csp: {
     enable: true,
-    reportUri: '',
     directives: {
-      defaultSrc: ["'self'"],
-      scriptSrc: ["'self'", "'unsafe-eval'", "vimeo.com", "https://gist.github.com", "www.slideshare.net", "https://query.yahooapis.com", "https://*.disqus.com"],
-      imgSrc: ["*"],
-      styleSrc: ["'self'", "'unsafe-inline'", "https://assets-cdn.github.com"],
-      fontSrc: ["'self'", "https://public.slidesharecdn.com"],
-      objectSrc: ["*"],
-      childSrc: ["*"],
-      connectSrc: ["'self'", "https://links.services.disqus.com", "wss://realtime.services.disqus.com"]
     },
+    addDefaults: true,
     upgradeInsecureRequests: 'auto'
   },
   protocolusessl: false,