Multiple webcams first commit

...pi/video-streams/server/handlers/userSharedHtml5Webcam.js

.../video-streams/server/handlers/userUnsharedHtml5Webcam.js

...ebutton-html5/imports/api/video-streams/server/helpers.js

...mports/api/video-streams/server/modifiers/sharedWebcam.js

...orts/api/video-streams/server/modifiers/unsharedWebcam.js

...ton-html5/imports/ui/components/actions-bar/component.jsx

...ton-html5/imports/ui/components/actions-bar/container.jsx

...ts/ui/components/breakout-join-confirmation/component.jsx

...luebutton-html5/imports/ui/components/media/container.jsx

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

...i/components/media/webcam-draggable-overlay/component.jsx

...ports/ui/components/multiple-video-provider/component.jsx

...ports/ui/components/multiple-video-provider/container.jsx

.../imports/ui/components/multiple-video-provider/service.js

...onents/multiple-video-provider/video-button/component.jsx

...onents/multiple-video-provider/video-button/container.jsx

...omponents/multiple-video-provider/video-button/service.js

...mponents/multiple-video-provider/video-button/styles.scss

...mponents/multiple-video-provider/video-list/component.jsx

...components/multiple-video-provider/video-list/styles.scss