statsbot panics when no config is given
$ statsbot
panic: strconv.Atoi: parsing "": invalid syntax
goroutine 1 [running]:
main.NewConfigFromEnv(0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, ...)
C:/Users/carstenh/Documents/gocode/src/git.kuschku.de/justJanne/statsbot/main.go:46 +0x39d
main.main()
C:/Users/carstenh/Documents/gocode/src/git.kuschku.de/justJanne/statsbot/main.go:115 +0x3e
Should return usage or some kind of info