Merge pull request #3211 from OZhurbenko/issue-3206

bigbluebutton-html5/client/main.html

bigbluebutton-html5/imports/api/common/server/helpers.js

...ports/api/slides/server/modifiers/addSlideToCollection.js

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

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

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

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

...tml5/imports/ui/components/whiteboard/slide/component.jsx