Fix pricingCountry implementation to properly process grouped batching
Fix pricingCountry implementation to properly process grouped batching

Grouped batching process expects grouped response for a group of calls based
on group by key.

jsdelfino/d-abacus,sasrin/cf-abacus,pombredanne/cf-abacus,18F/cf-abacus,cloudfoundry-incubator/cf-abacus,jsdelfino/x-abacus,KRuelY/cf-abacus,pombredanne/cf-abacus,jsdelfino/cf-abacus-experiment,cloudfoundry-incubator/cf-abacus,18F/cf-abacus,pombredanne/cf-abacus,danparsons/cf-abacus,cloudfoundry-incubator/cf-abacus,sasrin/cf-abacus,nmaslarski/cf-abacus,sasrin/cf-abacus,jsdelfino/d-abacus,danparsons/cf-abacus,nmaslarski/cf-abacus,BetaFood/cf-abacus-dev,rajkiranrbala/cf-abacus,jsdelfino/x-abacus,BetaFood/cf-abacus-dev,KRuelY/cf-abacus,jsdelfino/x-abacus,pombredanne/cf-abacus,KRuelY/cf-abacus,nmaslarski/cf-abacus,rajkiranrbala/cf-abacus,jsdelfino/cf-abacus-experiment,rajkiranrbala/cf-abacus,BetaFood/cf-abacus-dev,nmaslarski/cf-abacus,jsdelfino/cf-abacus-experiment,KRuelY/cf-abacus,rajkiranrbala/cf-abacus,jsdelfino/d-abacus,18F/cf-abacus,danparsons/cf-abacus,jsdelfino/d-abacus,jsdelfino/x-abacus