Refactor DeploymentRoleHostgroup and LayoutRole into a single join model
Merge pull request #38 from sseago/refactor_hostgroup_joins

Refactor DeploymentRoleHostgroup and LayoutRole into a single join model
augment migration with actual data fix

Prior migration worked if there was no data, but failed if there was
a Deployment. This works with or without a Deployment.
Merge pull request #42 from sseago/fix_deployment_role_hg_migration

augment migration with actual data fix