copySessionDescription adds a button to all examples that copies the
local Session Description. This makes it easier for users to copy the
values.
Resolves#2092
Logs: TypeError: pc.addStream is not a function.
Fixed js error when using safari due to deprecated
RTCPeerConnection.addStream() method.
Updated js fiddle examples to use the addTrack()
method instead.
jsfiddle provides a way to create snippets from Github via a URL. This
way we can still provide easy demos, but get all the nice things from
having them in Git
Closes#32