Preliminary submission - std.rational and std.typelist

[Arlen]

Just a quick update:

I have made Rational nothrow, fixed toString, and some other minor
changes.  For the past several months I've used Rational extensively in
units (see my other thread), and it works great.

source: https://github.com/Arlen/phobos/blob/std_rational/std/rational.d
docs: http://arlen.github.com/phobos/std_rational.html

What would be the next step, a formal review?

Arlen
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