allow foodcoops to add custom css

app/controllers/styles_controller.rb

@@ -0,0 +1,18 @@
+# Foodcoop-specific styling
+class StylesController < ApplicationController
+  skip_before_filter :authenticate
+
+  # renders foodcoop css, or 404 if not configured
+  #
+  # When requested with the parameter +md5+, the result is returned
+  # with an expiry time of a week, to leverage caching.
+  def foodcoop
+    css = FoodsoftConfig[:custom_css]
+    if css.blank?
+      render text: nil, content_type: 'text/css', status: 404
+    else
+      expires_in 1.week, public:true if params[:md5].present?
+      render text: css, content_type: 'text/css'
+    end
+  end
+end