var FirebaseAccount = require('firebase-admin');
var Firebase = require('firebase');
FirebaseAccount.getToken('user', 'pass')
.then(function(token) {
  var account = new FirebaseAccount(token);
  account.createDatabase('new-instance-name')
  .then(function(instance) {
    var fb = new Firebase(instance.toString());
  })
  .catch(function(err) {
    console.error('Oops, error creating instance:', err);
  });
});