Remove unnecessary orders routes
Remove unnecessary orders routes

* The orders resource in spree excludes index, new, create and destroy
  but the previous code was re-adding these back while trying to define
  nested resources.

  This patch fixes the unnecessary routes from being added by specifying
  that no order resource routes should be added.

fixes #186

blueapron/spree_gateway,panter/spree_gateway,mackweldon/spree_gateway,komoju/spree_gateway,jamatthews/spree_gateway,komoju/spree_gateway,panter/spree_gateway,hiagomeels/spree_gateway,spree/spree_gateway,karlitxo/spree_gateway,HoyaBoya/spree_gateway,mackweldon/spree_gateway,karlitxo/spree_gateway,mackweldon/spree_gateway,hiagomeels/spree_gateway,komoju/spree_gateway,quentinuys/spree_gateway,hoanghiep90/spree_gateway,panter/spree_gateway,hoanghiep90/spree_gateway,hiagomeels/spree_gateway,quentinuys/spree_gateway,HoyaBoya/spree_gateway,hoanghiep90/spree_gateway,blueapron/spree_gateway,spree/spree_gateway,dangerdogz/spree_gateway,kaspernj/spree_gateway,quentinuys/spree_gateway,dangerdogz/spree_gateway,kaspernj/spree_gateway,karlitxo/spree_gateway,jamatthews/spree_gateway,dangerdogz/spree_gateway,HoyaBoya/spree_gateway