Update generated GitHub Gist URLs
Update generated GitHub Gist URLs

The URLs for Gists now include the user ID.  Also the URLs for raw files
in a gist have totally changed.  Update our code to handle this.

Signed-off-by: Kevin Locke <ffb4761cba839470133bee36aeb139f58d7dbaa9@kevinlocke.name>

kevinoid/jekyll-highlight-file