gif recorder — added

Gif recorder demo:

https://www.webrtc-experiment.com/MediaStreamRecorder/demos/video-recorder.html
video recorder — added

Video/Gif recorder demo:

https://www.webrtc-experiment.com/MediaStreamRecorder/demos/video-recorder.html
audio recorder for chrome — added

Audio recorder demo:

https://www.webrtc-experiment.com/MediaStreamRecorder/demos/audio-recorder.html

https://www.webrtc-experiment.com/MediaStreamRecorder/