[MLton] style guide

[Stephen Weeks]

> > The style guide is intended to be relevant to far more than compiler
> > hackers.  It is intended to be applicable to general SML development.
> 
> I don't think it is applicable to _general_ SML development.  It is geared
> towards development of large SML projects. 

Fair enough.  My main point is that it is not restrictied to MLton
developers, or even compiler writers.  Some parts are for experienced
SML developers, while others are for novices, who I think benefit
greatly from having some well-tested conventions to follow.

> > My gut feeling is that
> > we're approaching the limit of the current navigation bar, but that
> > one more item may be ok.
> 
> Agreed.  If you move history and papers under documentation and add style
> guide and formal MLB to documentation, then I think you could leave user
> guide in the nav bar, since it's probably fairly high traffic.

Sounds perfect.