Reworked ES6 on the server side

bigbluebutton-html5/app/config.js

bigbluebutton-html5/app/server/bbblogger.js

bigbluebutton-html5/app/server/collection_methods/poll.js

...tton-html5/app/server/collection_methods/presentations.js

bigbluebutton-html5/app/server/collection_methods/shapes.js

bigbluebutton-html5/app/server/collection_methods/slides.js

bigbluebutton-html5/app/server/collection_methods/users.js

bigbluebutton-html5/app/server/publish.js

bigbluebutton-html5/app/server/server.js

bigbluebutton-html5/app/server/user_permissions.js