Remove need to ever edit makerstrap files directly

For example in `makerstrap.less` 

```css
// Uncomment for Font Awesome
// @import '@{makerstrap-bower-path}/font-awesome/less/font-awesome';
// @fa-font-path: '@{makerstrap-bower-path}/font-awesome/fonts';
```

Makerstrap should typically exist as a read-only module in bower_components.