Inject script to auto-reload browser when Rocket restarts about rocket

[the10thWiz]

This is more difficult than you might think. I'm not sure how npm's live-server works, but I suspect it's unloading and reloading the server, but keeping any existing steaming connections alive. For Rocket, because we aren't an interpreted language, when Rocket is restarted, the OS automatically resets every connection, so sockets would be disconnected in this case.

I think this could be implemented outside of Rocket, but it would require forking cargo watch to make it work. The idea is that it would open a Websocket Server on a different port (say 8001), and the client script would force reload the page when asked by the server. Injecting the client script automatically likely isn't worth the effort, especially since we don't know what each page is used for. I would suggest simply asking the users to inject it by hand, but a more automated solution might be possible via the webdriver spec.