Splits the top left Github|Gist logo into two URLS - the 'Github' part goes to Github, and 'Gist' goes to Gist.
A tiny bit of JavaScript to have clicking on the top left logo on Github's Gist page take back to github.
Solves a personal annoyance of mine, but I hope you'll find it useful as well.
Feel free to send me pull requests to improve it!