Branch for adding nodes to the cluster

patch2- typo and changed cli API
changed endpoints/cluster
-usage should be:
socketplane.sh agent add-endpoint
socketplane.sh agent del-endpoint

Havent tested the API calls yet
Associated with request:
https://github.com/socketplane/socketplane/issues/53

Signed-off-by: Brent Salisbury <brent@socketplane.io>