Delete unused factory
Merge branch '2-1-stable' of github.com:stevenbarragan/spree_sort_payment_methods into 2-1-stable

* '2-1-stable' of github.com:stevenbarragan/spree_sort_payment_methods:
  Update name of extension creator
  Update README * Add version to install
  Add missing files in gemspec * Update version * Add home page