Move hasStream to video-users collection

...on-html5/imports/api/users/server/modifiers/removeUser.js

bigbluebutton-html5/imports/api/video-users/index.js

...ton-html5/imports/api/video-users/server/eventHandlers.js

.../api/video-users/server/handlers/userSharedHtml5Webcam.js

...pi/video-users/server/handlers/userUnsharedHtml5Webcam.js

bigbluebutton-html5/imports/api/video-users/server/index.js

...luebutton-html5/imports/api/video-users/server/methods.js

...imports/api/video-users/server/methods/userShareWebcam.js

...ports/api/video-users/server/methods/userUnshareWebcam.js

.../imports/api/video-users/server/modifiers/sharedWebcam.js

...mports/api/video-users/server/modifiers/unsharedWebcam.js

...ebutton-html5/imports/api/video-users/server/publisher.js

...n-html5/imports/ui/components/subscriptions/component.jsx

...components/video-provider/many-users-notify/container.jsx

...ton-html5/imports/ui/components/video-provider/service.js

...orts/ui/components/video-provider/video-button/service.js

bigbluebutton-html5/server/main.js