This plugin is a collection of tags that can include content into a post or a page.
The Gist tag has the following syntax:
{% gist gist_id %}
This tag returns the HTML that is used to embed a gist. It takes the gist id as an argument.
The StackOverflow tag has the following syntax:
{% stack_overflow user_id [default|dark|clean|hotdog] [width [height]] %}
The goal of this tag is to render the flair of an user.
Download the latest release and copy Pretzel.IncludeExtras.dll to the _plugins folder at the root of your site folder (you may have to unblock the file).