Listen callback does not fire until first connection

[giodamelio]

When using vantage in standalone mode, the listen callback does not fire until I connect to it with the command line client.

var Vantage = require('vantage');
var vantageServer = new Vantage();

vantageServer
  .delimiter('$')
  .listen(2001, function() {
    console.log('Started vantage server at http://localhost:2001');
  });

[zakhenry]

This is by design, see https://github.com/dthree/vantage/blob/7e5a8019591f14bd0836875589c4795730c9e88c/lib/server.js#L195 - the callback is called on the socket connection event, not when the vantage server is initialised.