add join audio only, and imporov UX

...5/imports/api/breakouts/server/handlers/breakoutClosed.js

.../imports/api/breakouts/server/handlers/breakoutJoinURL.js

bigbluebutton-html5/imports/api/breakouts/server/methods.js

...l5/imports/api/breakouts/server/methods/createBreakout.js

...5/imports/api/breakouts/server/methods/endAllBreakouts.js

...l5/imports/api/breakouts/server/methods/requestJoinURL.js

...html5/imports/api/meetings/server/methods/transferUser.js

...utton-html5/imports/api/users/server/modifiers/addUser.js

bigbluebutton-html5/imports/startup/client/routes.js

bigbluebutton-html5/imports/startup/server/redis.js

...nents/Breakout-room/breakout-remaining-time/component.jsx

...nents/Breakout-room/breakout-remaining-time/container.jsx

...n-html5/imports/ui/components/Breakout-room/component.jsx

...n-html5/imports/ui/components/Breakout-room/container.jsx

...tton-html5/imports/ui/components/Breakout-room/service.js

...ton-html5/imports/ui/components/Breakout-room/styles.scss

.../ui/components/actions-bar/actions-dropdown/component.jsx

...ton-html5/imports/ui/components/actions-bar/component.jsx

...ton-html5/imports/ui/components/actions-bar/container.jsx

...components/actions-bar/create-breakout-room/component.jsx