Forms lib do not use vegas-cmf-core lib. Only requirements is php 5.4+ with phalcon 1.3.x installed.
Add vegas-cmf-forms to your composer.json. Run:
php composer.phar update
/vegas-cmf/forms/assets from your composer vendor to your project public directory.
If you have vegas-cmf-core with CLI installed, you can copy those files automaticaly by using command:
php /path/to/cli.php vegas:assets publish