TLDR: Police asked the developer to stop working on it.
(and judging by their Twitter activity, no crazy stuff happened)
https://web.archive.org/web/20150822042959/https://github.co...
Right, but the code is still there, still being developed, just on the master branch? That doesn't really square with "stopped working on it" - unless it's just a sham to dodge the police - but that sounds pretty dangerous? (As opposed to, say have someone else host it, host it in a new place etc).
https://github.com/shadowsocks/shadowsocks
"Removed according to regulations." vs:
https://github.com/shadowsocks/shadowsocks/tree/master
Is it the shadowsocks project dancing around github censorship, or github allowing ss to dance around chinese censorship?