Force Labels demo broken

[‮rekcäH nitraM‮]

The demo linked to at https://github.com/d3/d3-plugins/blob/master/force_labels/README.md doesn't work as it errors out with a js error message.

Please fix.

[Christopher Hackett]

Problem is a 404 on force_labels/force_labels.js because it points to a fork which does not exist any more.

Failed to load resource: the server responded with a status of 404 (Not Found)
https://raw.github.com/ZJONSSON/d3-plugins/master/force_labels/force_labels.js

[Ziggy Jonsson]

Github raw links fail as external references. I fixed he gist by simply copying the code from the repo.
Should work now.

[Jason Davies]

Thanks!