Allow reload from node server

[appfeel]

In this way, not only nodemon or supervisor can fire a reload event, but you can do:

reloadServer = reload(server, app, 1000);
watch.watchTree(__dirname + "/public", function (f, curr, prev) {
    console.log("Trying to reload...");
    reloadServer.reload();
});

Use case: let's say that you don't want the server to be restarted each time you change client files. In this way one can let nodemon skipping watching public files and let node server watching and reloading browser each time a change is detected in client files.

[alallier]

Thank you for the pull request. I apologize it took so long won't happen again in the future!