The new build script written in D

[kntroh]

== Quote from Jacob Carlborg (doob at me.com)'s article
> On 2012-08-31 16:09, kntroh wrote:
> > I understand. I was premature.
> > I will recover D1 section in the documentation and rakefile.
> >
> > When will Mac porting be?
> > I haven't Mac. So I can't help to that work.
> I'm working on it currently. It's just a lot of work.
I regret that it can't help.

I recovered D1 section and rakefile.
Will send pull request later.