Adjusting CPAN::Mirrors to make it more useful

I've cloned the cpanpm repo and played with CPAN::Mirrors to make it a
bit more useful for things outside of CPAN.pm. Most of its use in
CPAN.pm is to support urllist in CPAN::FirstTime, but I want to use it
to also update the urllist as I travel, and create other interesting
applications for it.

I haven't merged anything, but you can look at the firsttime branch:

https://github.com/briandfoy/cpanpm/blob/firsttime/lib/CPAN/Mirrors.pm

I have some other refactorings to do, but I don't want to drop them all
on you at once.

And, who makes the MIRRORED.BY file? I imagine that's something from a
script that Jarkko makes, but how does it get the data? I'd like to see
about exporting it as JSON or something. Also, is it something that
noc.perl.org has to handle as the master CPAN moves off of FUNET?

-- 
brian d foy <[email protected]>