merge master

src/assets/avatars/avatars.js

...sets/environments/cliff_meeting_space/CliffVista_mesh.glb

...assets/environments/cliff_meeting_space/FloorNav_mesh.glb

...s/environments/cliff_meeting_space/MeetingSpace1_mesh.glb

...s/environments/cliff_meeting_space/OutdoorFacade_mesh.glb

src/assets/environments/cliff_meeting_space/bundle.json.tpl

...ts/environments/cliff_meeting_space/preview-thumbnail.png

src/assets/images/default_thumbnail.png

src/assets/stylesheets/hub-create.scss

src/components/gltf-bundle.js

src/hub.html

src/hub.js

src/react-components/avatar-selector.js

src/react-components/home-root.js

src/react-components/hub-create-panel.js

src/react-components/ui-root.js

webpack.config.js