refactor product's specs to use shoulda-matchers instead of regexp
refactor product's specs to use shoulda-matchers instead of regexp

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