Go Origin Checking

[tsmada]

The websocket implementation (Gorilla) in Go is safe defaulting where the origin is being sent from the client when viewing from Chrome as file:// which does not match the host request header. The CheckOrigin function stub can be found here

It's currently returning true (allowing all Origin headers).

It would be good to allow localhost:* or any origins in a list supplied by env var.

[csjoblom]

Should be all fixed now.