Fix usage collector to not process usage for an unknown resource
Fix usage collector to not process usage for an unknown resource

Usage collector should not process an usage when provision validation fails.

Related to github issue #84.

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