Support for .conda package mirroring

[anjos]

Apparently, https://repo.anaconda.com/pkgs/main now supports a speedier version of the tarballs dubbed ".conda" packages (https://www.anaconda.com/how-we-made-conda-faster-4-7/). It is curious that the "index.html" generated by conda index does not show them, but you can try and download any of the packages by replacing the .tar.bz2 extension by .conda, and it works.

It would be cool if this package also mirrored those. Currently, it is bound to mirror only *.tar.bz2 packages.

[ericdill]

All development is now over on the regro fork https://github.com/regro/conda-mirror/issues