File Watch example.

This example sends a file to the browser client for display whenever the file is modified.

$ go get github.com/wilsonwang371/websocket
$ cd `go list -f '{{.Dir}}' github.com/wilsonwang371/websocket/examples/filewatch`
$ go run main.go <name of file to watch>
# Open http://localhost:8080/ .
# Modify the file to see it update in the browser.