tianon/gosu 1.1 on GitHub

add LockOSThread and explicit GOMAXPROCS to ensure even more explicitly that we're running in the same thread for the duration
add better version output (including compilation info)
build against Go 1.3 (via tianon/golang and the new Dockerfile+build.sh)

$ ./gosu
Usage: ./gosu user-spec command [args]
   ie: ./gosu tianon bash
       ./gosu nobody:root bash -c 'whoami && id'
       ./gosu 1000:1 id

./gosu version: 1.1 (go1.3 on linux/amd64; gc)