std.rational -- update and progress towards review

[Dicebot]

On Thursday, 3 October 2013 at 10:51:22 UTC, Joseph Rushton 
Wakeling wrote:
> Ahh, OK -- thanks for clarifying.  But either way, what I meant 
> is: the module needs to be provided for review in a way that is 
> diff-able against current Phobos, no?

Yes. Common approach is to fork phobos in private repository and 
integrate proposed code there so that it will be available for 
easy review. Doing actual pull request will only distract Phobos 
devs and it not really needed.