Dynamically choose video quality lower

[LukasReschke]

The video quality should be chosen dynamically to ensure the best experience for every user.

[fancycode]

WebRTC should adapt to the currently available bandwidth / latency. There should however be a way to set the video quality to grab from the camera which then will be the maximum quality (that is unless we support changing the quality through renegotiation, which doesn't work in all browsers yet).

[LukasReschke]

Set to 1280x720 now. (

spreed/js/webrtc.js

Lines 106 to 109 in 5573e68

	video: {
	width: { max: 1280 },
	height: { max: 720 }
	}

)