A user script to add extensions to Google Prettify on Stack Exchange sites.

Right now, it adds hail2u's Vim extension from and sets it as the default for:

• Vi and Vim
• Meta Vi and Vim
• Posts with tags matching vim on other SE sites

Code blocks manually identified as another language using <!-- language: foo --> will be left untouched.

I hope to add a UI and the ability to add other extensions.