Config Option to Bar Lizards from Authority Roles

aka formalizing Human Supremacy in SS13

- Adds a config option ENFORCE_HUMAN_AUTHORITY which prevents non-human players from joining Command and Security roles
- starts off by default

[Lizard subjugation intensifies]
Probably for the best

Sent from my iPhone

> On Sep 6, 2014, at 3:55 AM, "Swag McYolosteinen" <notifications@github.com> wrote:
> 
> In config/game_options.txt:
> 
> > @@ -128,6 +128,9 @@ TRAITOR_OBJECTIVES_AMOUNT 2
> >  ## implants from being most antagonists.
> >  #PROTECT_ROLES_FROM_ANTAGONIST
> >  
> > +## If non-human species are barred from joining as a head/security
> > +ENFORCE_HUMAN_AUTHORITY
> comment this out by default, please.
> 
> —
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