allow circle API env overrides
allow circle API env overrides

brint/cassandra,pratikmallya/cassandra,pratikmallya/cassandra,brint/cassandra,brint/cassandra,rackspace-orchestration-templates/cassandra,pratikmallya/cassandra,pratikmallya/cassandra,rackspace-orchestration-templates/cassandra,rackspace-orchestration-templates/cassandra,brint/cassandra,rackspace-orchestration-templates/cassandra