Start removing everything bootswatch related from the repo

- index still needs to be cleaned

assets/scss/build.scss

 @import "variables";
 @import "../bower_components/bootstrap/scss/bootstrap";
-@import "bootswatch";
+@import "masonstrap";

package.json

@@ -13,7 +13,7 @@
     "node": ">= 6.10.0"
   },
   "scripts": {
-    "postcss": "postcss --config assets/js/postcss.js --replace */bootstrap*.css"
+    "postcss": "postcss --config assets/js/postcss.js --replace */masonstrap*.css"
   },
   "devDependencies": {
     "autoprefixer": "^6.5.0",