Refactor Auth logout and credentials getter

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

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

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

...5/imports/ui/components/actions-bar/emoji-menu/service.js

...button-html5/imports/ui/components/actions-bar/service.js

bigbluebutton-html5/imports/ui/components/app/container.jsx

bigbluebutton-html5/imports/ui/components/app/service.js

...5/imports/ui/components/logout-confirmation/component.jsx

...ebutton-html5/imports/ui/components/nav-bar/container.jsx

bigbluebutton-html5/imports/ui/components/nav-bar/service.js

...i/components/presentation/presentation-toolbar/service.js

bigbluebutton-html5/imports/ui/services/api/index.js

bigbluebutton-html5/imports/ui/services/auth/index.js