[MLton] using MLBs for scripting

[Stephen Weeks]

> So ... can we hope for a REPL in the near future?  I think that's
> the main thing holding me back from using it more at this point.

Yes, I plan to put a REPL in *after* the upcoming release.  Hopefully
that means its only a few months out.

> PLT Scheme recently created the "PLaneT" system, which does this for
> Scheme (PLT Scheme).  We might want to think about something similar.
> (see http://planet.plt-scheme.org/)

Thanks.  I will investigate them as well.