Simple extention to sort products within a taxon & global index.
It works by creating a new DB table to store the product positions for each taxon, and adding an admin view that lets you drag-and-drop them into place.
Based on: https://github.com/jdevine/spree-ordering-in-taxons
Add gem
gem 'spree_product_sort', :git => 'git://github.com/GeekOnCoffee/spree_product_sort.git'
bundle install
Add Migration and assets
rails g spree_product_sort:install