Add ws(s) protocol "support"

[pbihler]

Since these protocols are often given instead of "http(s)" when connecting to a socket.io server

[nuclearace]

I don't think this makes sense. socket.io by default will use http polling before it switches to WebSocket. And you can't point this to an arbitrary WebSocket server, because it's specifically looking for socket.io. I could see this being use as a way to force WebSocket though.