Removing pug plugin

- Due to this:
https://gitter.im/cake-build/cake?at=56410e2d8b872257348e17ef
- If/when this PR gets accepted:
hubot-archive/hubot-pugme#1
- We can think about adding this back in

external-scripts.json

@@ -5,7 +5,6 @@
   "hubot-google-images",
   "hubot-google-translate",
   "hubot-karma-classic",
-  "hubot-pugme",
   "hubot-maps",
   "hubot-redis-brain",
   "hubot-rules",

package.json

@@ -20,7 +20,6 @@
     "hubot-humanity": ">= 0.0.0",
     "hubot-irc": "^0.2.7",
     "hubot-maps": "0.0.1",
-    "hubot-pugme": "^0.1.0",
     "hubot-redis-brain": "0.0.2",
     "hubot-rules": "^0.1.0",
     "hubot-scripts": "^2.5.16",