migrate from jade to pug

see https://github.com/pugjs/pug#rename-from-jade

package.json

@@ -34,7 +34,7 @@
   "devDependencies": {
     "body-parser": "^1.13.3",
     "express": "^4.13.2",
-    "jade": "^1.11.0",
+    "pug": "^2.0.0-beta3",
     "mocha": "*",
     "standard": "^7.1.1"
   },

test/server.js

@@ -12,7 +12,7 @@ var express = require('express')
 // Config
 
 app.set('views', __dirname + '/views');
-app.set('view engine', 'jade');
+app.set('view engine', 'pug');
 
 // Middleware