Documentation fixed.
RTCMultiConnection-v1.4 demo using socket.io over node.js - added
RTCMultiConnection v1.3 and v1.4 fixed for #59

Demo: https://googledrive.com/host/0B6GWd_dUUTT8LUc4TmczVjlhU1k/

Note: "Reneogtiation" feature is not fully supported in v1.3. It is
planned to be supported in upcoming updates (in v1.4).
RTCMultiConnection-v1.5 fixed for #60

Demos:

https://webrtc-experiment.appspot.com/RTCMultiConnection-v1.5-Demos/All-in-One.html

https://webrtc-experiment.appspot.com/RTCMultiConnection-v1.5-Demos/Renegotiation.html

https://webrtc-experiment.appspot.com/RTCMultiConnection-v1.5-Demos/Video-Conferencing.html