mirah is now an organization on github, moving repo

[Charles Oliver Nutter]

I've made "mirah" an organization on github:

http://github.com/organizations/mirah
http://github.com/mirah

I'm in the process of moving the Mirah repository from headius/mirah
to mirah/mirah right now:

http://github.com/mirah/mirah

It should be identical to the headius/mirah repository as of this
moment. I'll remove committers from the headius/mirah repository so
everyone should move to the new (and final) repository at mirah/mirah.

- Charlie