Drop in the embed code from github between the gist shortcode.
[gist]<script src="http://gist.github.com/447298.js?file=github_gist_wordpress_plugin_test.txt"></script>[/gist]
or pass the ID and file (optional)
[gist id=447298 file=github_gist_wordpress_plugin_test.txt]
Te puedes descargar este plugin para utilizarlo en tu sitio de .