Merge tag 'v2.2.1'

2.2.1
Remove strong-agent and strong-cluster-control

Run loopback under strong-supervisor to use agent and clustering.
Merge pull request #39 from strongloop/feature/remove-agent-and-cluster-control-dependencies

Remove strong-agent and strong-cluster-control
Bump version
Merge branch 'release/2.3.0' into production