Initial commit
Draft Service Management API (modularised version)

Jira issue: WP-933
Service Management API with three methods
register(service, succCB, errCB)
unregister(service, succCB, errCB)
listRegisteredServices(succCB, errCB)

"service" parameter can be taken from listing methods. It's necessary to
add a listAvailableServices method.

Jira issue: WP-933
Merged with webinos/webinos-api-serviceManagement to send PRs