- Add Step Progress Bar.

- Prefix partials with `_`.

scss/essence.scss

@@ -18,6 +18,7 @@
 @import 'elements/sidebar';
 @import 'elements/footer';
 @import 'elements/radio';
+@import 'elements/step-progress-bar';
 
 // Vendors
 @import 'vendors/prismjs';