Add tax related controllers from spree_backend related to config

app/controllers/spree/admin/tax_categories_controller.rb

@@ -0,0 +1,19 @@
+module Spree
+  module Admin
+    class TaxCategoriesController < ResourceController
+      def destroy
+        if @object.destroy
+          flash[:success] = flash_message_for(@object, :successfully_removed)
+          respond_with(@object) do |format|
+            format.html { redirect_to collection_url }
+            format.js   { render :partial => "spree/admin/shared/destroy" }
+          end
+        else
+          respond_with(@object) do |format|
+            format.html { redirect_to collection_url }
+          end
+        end
+      end
+    end
+  end
+end

app/controllers/spree/admin/tax_rates_controller.rb

@@ -0,0 +1,26 @@
+module Spree
+  module Admin
+    class TaxRatesController < ResourceController
+      before_filter :load_data
+
+      update.after :update_after
+      create.after :create_after
+
+      private
+
+      def load_data
+        @available_zones = Zone.order(:name)
+        @available_categories = TaxCategory.order(:name)
+        @calculators = TaxRate.calculators.sort_by(&:name)
+      end
+
+      def update_after
+        Rails.cache.delete('vat_rates')
+      end
+
+      def create_after
+        Rails.cache.delete('vat_rates')
+      end
+    end
+  end
+end