allow circle API env overrides
allow circle API env overrides

usljimrose/docker,atxwebs/docker,atxwebs/docker,atxwebs/docker,kvchampa/rackspace-docker,rackspace-orchestration-templates/docker,rackspace-orchestration-templates/docker,pratikmallya/docker,atxwebs/docker,rackspace-orchestration-templates/docker,usljimrose/docker,pratikmallya/docker,usljimrose/docker,kvchampa/rackspace-docker,rackspace-orchestration-templates/docker,kvchampa/rackspace-docker,kvchampa/rackspace-docker,pratikmallya/docker,usljimrose/docker,pratikmallya/docker