Merge branch 'master' of github.com:mozilla/hubs

src/assets/stylesheets/2d-hud.scss

src/assets/stylesheets/index.scss

src/assets/stylesheets/invite-dialog.scss

src/assets/stylesheets/shared.scss

src/assets/stylesheets/ui-root.scss

src/hub.html

src/hub.js

src/react-components/home-root.js

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

src/react-components/invite-dialog.js

src/react-components/link-root.js

src/react-components/ui-root.js