Use NPM to install bourbon

bower.json

@@ -4,7 +4,6 @@
   "version": "2.0.5",
   "license": "MPL-2.0",
   "devDependencies": {
-    "bourbon": "~4.2.6",
     "fontawesome": "~4.1.0"
   },
   "dependencies": {},

package.json

@@ -38,6 +38,7 @@
     "backbone.browserStorage": "0.0.3",
     "backbone.overview": "0.0.3",
     "bootstrap": "^3.3.7",
+    "bourbon": "^4.3.2",
     "bower": "latest",
     "clean-css": "^3.4.19",
     "eslint": "^3.14.1",