GUACAMOLE-674: added env variable for member attribute
GUACAMOLE-674: added env variable for member attribute

necouchman/incubator-guacamole-client,glyptodon/guacamole-client,glyptodon/guacamole-client,jmuehlner/incubator-guacamole-client,glyptodon/guacamole-client,mike-jumper/incubator-guacamole-client,jmuehlner/incubator-guacamole-client,jmuehlner/incubator-guacamole-client,mike-jumper/incubator-guacamole-client,glyptodon/guacamole-client,mike-jumper/incubator-guacamole-client,mike-jumper/incubator-guacamole-client,glyptodon/guacamole-client,necouchman/incubator-guacamole-client,jmuehlner/incubator-guacamole-client,necouchman/incubator-guacamole-client,necouchman/incubator-guacamole-client