add initial network logic

bigbluebutton-html5/imports/api/network-information/index.js

...ton-html5/imports/api/network-information/server/index.js

...n-html5/imports/api/network-information/server/methods.js

...ork-information/server/methods/userInstabilityDetected.js

...html5/imports/api/network-information/server/publisher.js

...pi/users/server/methods/setUserEffectiveConnectionType.js

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

...html5/imports/ui/components/slow-connection/component.jsx

...user-participants/user-list-item/user-icons/component.jsx

...-html5/imports/ui/components/video-provider/component.jsx

...on-html5/imports/ui/services/network-information/index.js

bigbluebutton-html5/private/config/settings.yml

bigbluebutton-html5/server/main.js