Combining files to have only a single call for all CSS files with Assetic on Symfony 2
{% javascripts
    '@AcmeFooBundle/Resources/public/js/*'
    '@AcmeBarBundle/Resources/public/js/form.js'
    '@AcmeBarBundle/Resources/public/js/calendar.js'
%}
<script src="{{ asset_url }}"></script>
{% endjavascripts %}