Fix resource config to handle error responses from provisioning
Fix resource config to handle error responses from provisioning

Handle non-200 HTTP response codes and return an error when retrieving
resource configuration details.

Fixes #99.

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