That's really stupid. There's no plausible reason that the end of that method shouldn't have a semi-colon. I honestly wouldn't advise anyone use Twitter Bootstrap. You should always use semicolons in Javascript even if you're hippie. Hippies use coffeescript.
And I think Google's style guide[1] is prevail over Github's style guide[2].
I think if you build your app properly the only problem with DDoS is traffic. Github partnerships with Rackspace so their cloud traffic can't be expensive. Correct me if I'm wrong.