Travis test against Ruby 2.2.5 and 2.3.1, setup Travis cache
Travis test against Ruby 2.2.5 and 2.3.1, setup Travis cache

vinayvinsol/spree,siddharth28/spree,brchristian/spree,vinayvinsol/spree,calvinl/spree,vinsol/spree,DarkoP/spree,vinsol/spree,vinayvinsol/spree,siddharth28/spree,ayb/spree,DarkoP/spree,ayb/spree,DarkoP/spree,calvinl/spree,siddharth28/spree,imella/spree,siddharth28/spree,ayb/spree,brchristian/spree,ayb/spree,calvinl/spree,imella/spree,imella/spree,brchristian/spree,vinsol/spree,DarkoP/spree,calvinl/spree,vinsol/spree,vinayvinsol/spree,brchristian/spree