request: return a promise from .build

[jonschlinkert]

I think this would make .build nicer to use when composing tasks with prompts.

app.task('confirm', function() {
  return new Confirm({name: 'foo', message: 'Want to run "foo"?'});
    .run()
    .then(function(answer) {
      return app.build(answer ? 'foo' : 'bar');
    });
});

[jonschlinkert]

ping