second attempt to fix hostgroup ordering for orchestration

Rather than messing with custom sql, this PR just removes the
attempt at ordering child_hostgroups in the association.
Instead, we call .reorder() explicitly in deploy.rb where
we attempt to deploy the hosts.
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
Wire models with wizard steps 2 and 3

We still need the service parameters for step 3
Merge pull request #35 from jtomasek/models2

Wire models with wizard steps 2 and 3
Merge pull request #41 from sseago/deploy_order_fix2

second attempt to fix hostgroup ordering for orchestration