Update build & deploy settings for CircleCI

package.json

@@ -4,7 +4,7 @@
   "description": "Source code for http://crafting-guide.com",
   "main": "./build/index.js",
   "scripts": {
-    "prepublish": "grunt build",
+    "prepublish": "grunt prepublish",
     "test": "grunt test"
   },
   "repository": {
@@ -24,6 +24,7 @@
     "grunt": "^0.4.5",
     "grunt-browserify": "^3.2.1",
     "grunt-contrib-clean": "^0.6.0",
+    "grunt-contrib-coffee": "^0.13.0",
     "grunt-contrib-copy": "^0.7.0",
     "grunt-contrib-jade": "^0.13.0",
     "grunt-contrib-sass": "^0.8.1",