removed scattered dead code

mineos.mc doesn't need an emitter (per current design, at least).
updated webui to use new mc.create using creds
relocated directive for webui to track

the server.js telling the web-ui to track a new server happens after
chokidar successfully detected the server, rather than after the server
confirmed to have made the directory.  this avoids a race condition
where the web-ui wants to track a server that the server hasn't
"detected" yet.