Replace require_tree with declerative requirements

This way developers can override individual files in their projects

Author: damianlegawiec

frontend/app/assets/javascripts/spree/frontend.js

@@ -10,7 +10,32 @@
 //= require ./lazysizes.config
 //= require lazysizes.min
 //= require turbolinks
-//= require_tree ./frontend
+//= require spree/frontend/account
+//= require spree/frontend/api_tokens
+//= require spree/frontend/carousel-noconflict
+//= require spree/frontend/cart
+//= require spree/frontend/checkout
+//= require spree/frontend/checkout/address
+//= require spree/frontend/checkout/address_book
+//= require spree/frontend/checkout/payment
+//= require spree/frontend/checkout/shipment
+//= require spree/frontend/views/spree/home/product_carousels
+//= require spree/frontend/views/spree/layouts/spree_application
+//= require spree/frontend/views/spree/product/related
+//= require spree/frontend/views/spree/products/cart_form
+//= require spree/frontend/views/spree/products/description
+//= require spree/frontend/views/spree/products/index
+//= require spree/frontend/views/spree/products/modal_carousel
+//= require spree/frontend/views/spree/shared/carousel
+//= require spree/frontend/views/spree/shared/carousel/single
+//= require spree/frontend/views/spree/shared/carousel/swipes
+//= require spree/frontend/views/spree/shared/carousel/thumbnails
+//= require spree/frontend/views/spree/shared/delete_address_popup
+//= require spree/frontend/views/spree/shared/mobile_navigation
+//= require spree/frontend/views/spree/shared/nav_bar
+//= require spree/frontend/views/spree/shared/product_added_modal
+//= require spree/frontend/views/spree/shared/quantity_select
+//= require spree/frontend/turbolinks_scroll_fix
 
 Spree.routes.api_tokens = Spree.pathFor('api_tokens')
 Spree.routes.ensure_cart = Spree.pathFor('ensure_cart')