def save
      send("principals=", client_principal.to_abbreviated)
      client.put(api_path, to_json, headers)
      true
    end
def save
      send("principals=", client_principal.to_abbreviated)
      client.put(api_path, to_json, headers)
      true
    end
Save the PermissionTarget to the artifactory server.
 See http://bit.ly/1qMOw0L

 @return [Boolean]