support specifying source control repository for a service
support specifying source control repository for a service

  + parses docker-compose.yml to allow adding a `com.tarantino.source` label to docker-compose services
  + does not yet do anything with the value specified, but anticipating using an npm-like algorithm for various sources
  + begin renaming dc_get_all_services and dc_get_services to something more explicit

meet-tarantino/tarantino