new home for libgit2 project

I've (mostly) moved libgit2 to repo.or.cz (thanks Pieter for
releasing the mirror, thanks Pasky for the free hosting!):

  http://repo.or.cz/w/libgit2.git
  git://repo.or.cz/libgit2.git

Thus far its able to format and parse SHA-1 strings, and read
loose objects from a repository.  It also doesn't compile on
Mac OS X as the Mach-O file format doesn't support the use of
__thread declarations on variables...

-- 
Shawn.