utilizacao de scripts para browsers modernos e browsers antigos no grunt.
<!-- build:js({app,.tmp}) scripts/capacete-old.js -->
<!--[if lt IE 9]>
<script src="scripts/para/ie8/ou/menor"></script>
<![endif]-->
<!-- endbuild -->
<!--[if gt IE 8]><!-->
<!-- build:js({app,.tmp}) scripts/capacete.js -->
<script src="scripts/para/browsers/modernos"></script>
<!-- endbuild -->
<!--<![endif]-->