Constructs a new Vanity client.  Options are: url    - URL to the vanity server (e.g. "http://vanity.internal") token  - Access token
function Vanity(options) {
  this.connected = false;
  if (options) {
    this.url = options.url;
    this.token = options.token;
  }
  // We emit this error when we can't make send a request, but we don't want
  // the default behavior of uncaught exception to kill Node.
  this.on("error", function() { });
}